Maria Kinali is amazing. She was the senior PN at Chelsea & Westminster, resigned in Jan 2018 because she said she couldn’t do her job properly there. C&W are a complete mess and I agree with beaG, avoid at all costs if you can (except if you need a referral to GOSH which they will do wilingly).
Dr Kinali works at the Portland and Cromwell and teaches at Imperial. She is known for diagnosing difficult/rare disorders and syndromes. She is v well connected to all the other specialists too and can get your child seen by almost anyone. She is also good at navigating Bupa and persuading them to pay for extra tests etc. I’ve heard wonderful things about Martinez too.