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All this information provided by gemini Ai

If you are looking for the absolute fastest and cheapest way to get a "diagnosis" purely for your own peace of mind, there are two main options. However, be aware that these will not be legally or medically recognised by the NHS, schools, or the government. 

1. The "Consultation Opinion" (Fastest & Mid-Price)

Some private clinics offer a "Diagnostic Opinion" rather than a full multidisciplinary assessment. 

• What it is: A 60–90 minute session with a single psychiatrist or psychologist who reviews your traits and gives their clinical opinion.
• Cost: Approximately £900 – £1,000.
• Speed: Often available within 1–2 weeks.
• Result: You get a letter stating you "meet the criteria" for autism in the clinician's view, but this is not a formal, NICE-compliant diagnostic report.  Berkeley Psychiatrists +4

2. Self-Screening with a Professional Review (Cheapest)

If you just want professional confirmation of your own research without a high price tag:

• What it is: You complete standardized "gold standard" screening tools like the AQ-50 or RAADS-R online and pay for a brief professional "review" or feedback session.
• Cost: Some initial consultations or "pre-assessments" cost as little as £99 – £186.
• Speed: Immediate for the tests, with a follow-up call often possible within days.
• Result: This is a screening, not a diagnosis. It confirms if you "show significant traits" and should seek a full assessment