A Comprehensive ADHD assessment designed to bring clarity.
Not just a checklist. A clinically grounded assessment designed to understand your experiences in depth.
Prompt appointments, without a long wait.
With Dr Sonney Gullu-McPhee
Psy.D, MA, MSc, CPsychol, AFBPsS
Chartered Clinical Psychologist | HCPC & BPS Registered | ISST Certified Advanced Schema Therapist
Many adults who come to me have spent years sometimes decades trying to understand why certain things feel harder than they seem to for others.
You may be functioning well on the surface, while privately feeling overwhelmed, disorganised or exhausted by the effort it takes to keep up.
If you’ve been wondering whether ADHD might explain some of these long-standing patterns, a careful assessment can help you understand what is going on and what to do next.
- Start with a free 15-minute consultation to see if an ADHD assessment is the right next step for you.
AT A GLANCE
Age Range
Adults aged 17+
Location
Petersfield, Hampshire
Report
Comprehensive written report
Format
In-person or online
Complete ADHD Assessment
Screening consultation, full diagnostic assessment, feedback session & written report
Fee
£1,650
IS THIS RIGHT FOR YOU?
You may benefit from an ADHD assessment if you:
- have struggled with focus, organisation or follow up for years
- often feel overwhelmed by everyday responsibilities
- wonder whether ADHD could explain long-standing patterns in your life
- want a clear, professional understanding of what’s going on
A detailed assessment of how ADHD may be affecting your life
The assessment explores how attention, organisation, motivation, emotion regulation and other ADHD related patterns have shown up across your life. It also considers your developmental history, current circumstances and other possible explanations, so the conclusions are based on the full clinical picture rather than symptoms alone.
WHAT YOU WILL RECEIVE
- A thorough, evidence-based assessment informed by NICE guideline NG87 for ADHD for ADHD
- A comprehensive written report you can use with your GP, university, employer, or insurer
- Personalised recommendations tailored to your specific profile
- Honest, clear feedback, whether or not ADHD is diagnosed
- Guidance on appropriate next steps, including medication referral where relevant
The aim is for you to leave with a clearer understanding of how your experiences have developed over time, how they affect your day-to-day life, and a sense of direction about what to do next.
• Complete ADHD assessment:
£1,650
A brief, no-obligation call to talk through your concerns, answer your questions, and consider whether an ADHD assessment may be the right next step.
We explore your current difficulties, developmental and mental health history, and the reasons you are considering an ADHD assessment. Screening questionnaires are reviewed as part of this consultation. If a full assessment appears appropriate, I will explain the next stage and send additional assessment measures for you to complete before the diagnostic assessment appointment.
The detailed diagnostic assessment brings together the information gathered so far, including your developmental questionnaire and collateral information from someone who has known you since childhood where available.
The assessment includes a structured clinical interview using the DIVA-5 to explore ADHD symptoms across childhood and adulthood, how they affected different areas of your life, and whether the diagnostic criteria are met.
I also carry out a differential diagnostic assessment, considering whether other factors such as anxiety, depresion, trauma, autism, sleep difficulties or other psychological and developmental factors better explain of contribute to or occur alongside of your difficulties.
The aim is to reach a balanced clinical conclusion based on the full picture, rather than relying on ADHD symptoms alone.
I will explain the outcome clearly, including whether ADHD criteria are met, how I reached that conclusions and what findings mean for you. You will also receive a comprehensive written report with personalised recommendations, and guidance on next steps, including medication pathways where appropriate.
Where ongoing psychological support would help after your assessment, I also offer ADHD therapy in Petersfield, Hampshire and online.
Thoughtful clinical expertise — not a high-volume diagnostic service
Assessment by an experienced Chartered Clinical Psychologist
I hold a Doctorate in Clinical Psychology and have extensive postdoctoral training in assessment, diagnostic clarification and complex case formulation. I have also completed specialist adult ADHD assessment training with UKAAN, and my assessments are informed by AQAS standards.
Read More
My doctoral training in the United States was APA accredited and included work across educational and medical settings, with advanced training in cognitive and personality assessment. This broader assessment background helps me understand ADHD within the context of the whole person, including where symptoms may overlap with other psychological of neurodevelopmental difficulties.
I personally carry out and interpret every assessment.
Rigorous, multi-method assessment
Rather than relying on a single questionnaire or self-report tool, I draw on clinical interview, developmental history, standardised ADHD measures and where appropriate, information from someone who knows you well. These different sources are considered together alongside clinical judgement.
Careful consideration of the full picture
ADHD does not exist in isolation. Where relevant, i consider other factors that may overlap with or better explain your experiences, including anxiety, depression, trauma, autism and other psychological or neurodevelopmental difficulties. These are considered carefully as part of the overall formulation and reflected clearly in your report.
DOES THIS SOUND FAMILIAR?
Attention and focus
- Struggling to stay focused, especially on tasks that don’t interest you
- Your mind drifting or switching quickly between thoughts
- Finding it hard to finish tasks, even when you’ve started with good intentions
Organisation and daily life
- Feeling disorganised or overwhelmed by everyday responsibilities
- Losing track of important things like keys, appointments, or deadlines
- Difficulty planning or breaking tasks into manageable steps
Time and follow-through
- Chronic procrastination or leaving things until the last minute
- Underestimating how long things will take
- Feeling like you are always trying to catch up
Motivation and task initiation
- Struggling to get started on tasks, even when they feel important
- Needing pressure or urgency to begin
- Feeling stuck or unable to follow through despite good intentions
Emotional experience
- Feeling easily overwhelmed or mentally overloaded
- Emotional ups and downs or sensitivity to stress
- Frustration with yourself for not doing things the way you “should”
Restlessness and mental activity
- A busy or constantly active mind
- Difficulty switching off or relaxing
- Feeling internally restless, even if you don’t appear hyperactive
Many people come to an ADHD assessment after years of trying to understand themselves.
The aim is to make sense of these patterns with clarity and without judgement
Structured, comprehensive, and grounded in recognised UK clinical standards.
My approach to ADHD assessment is structured, comprehensive, and grounded in recognised UK clinical standards including NICE guidelines NG87 and the UK Adult ADHD Network (UKAAN) Adult ADHD Assessment Quality Assurance Standard (AQAS).
Rather than relying on a single test or checklist, I take a formulation-led approach that brings together your history, current experiences, and the context in which your difficulties occur.
The assessment is based on a detailed clinical evaluation of your experiences over time, across different settings, and within the context of your developmental history.
The aim is to develop a clear and balanced understanding of your individual profile, considering both strengths and challenges, and whether ADHD or other factors may best explain your experiences.
Comprehensive Psychological Profile
WHAT YOU WILL RECEIVE
For some people, the goal is not to identify a specific diagnosis, but to gain a deeper and more complete understanding of themselves.
You may feel that your patterns, emotional responses, or life experiences are complex, longstanding, or difficult to fully make sense of, even after previous therapy or attempts to find answers.
If you are looking for a structured and in-depth understanding of your personality, emotional patterns, and how your experiences fit together, I also offer a different kind of comprehensive psychological profiling assessment.
A comprehensive psychological assessment designed to develop a clear and integrated understanding of your psychological functioning.
This is a formulation-led process focused on understanding the whole person, rather than assessing for a specific condition or diagnosis.
The assessment may include, where appropriate, the use of standardised psychometric measures alongside clinical expertise to build a detailed psychological profile.
Clear answers to common concerns
How is this different from an NHS assessment?
NHS waiting lists for adult ADHD assessment currently run to several years in many areas. This service offers the same clinical rigour with no waiting list, a more thorough process, and a detailed written report suitable for use with employers, academic institutions, or your GP.
Will the report be shared with anyone?
No. Your report is confidential and shared only with you. You decide who to share it with. A shorter summary letter can also be provided if needed.
What if I don't meet the criteria for ADHD?
This is more common than people expect, and it does not mean the process has been wasted. You will leave with a clear understanding of what is affecting you and what to do next.
How long does the report take?
The written report is typically provided within two weeks of your assessment session.
Can I explore medication if ADHD is diagnosed?
Yes. If ADHD is diagnosed and medication feels appropriate, a referral to a medical professional will be provided.
Are online assessments as thorough as in-person ones?
Yes. Remote assessments follow the same clinical process and depth, and many clients find them more comfortable and convenient.
BOOK A CONSULTATION
Take the first step towards understanding your experiences.
Appointments are limited each month to ensure every client receives the depth of assessment they deserve.