I think my Dd1 has self diagnosed, whether she will ever get a formal Dx I dont know.
We went round in circles with Dd1 from age 4-9 and then I gave up, having been told it was my parenting that was causing the problem
With Dd3 we went round in circles from 5.5 until 9 when the DISCO was done and ASD was diagnosed.
Dd3 is not as mercenary[sp] as Dd3, she has alot more sensory and co ordination issues so I suppose ultimately she was easier to diagnose.
The thing which helped us most was the diary TBH, it finally made proffs sit up and listen, when they realised what we were trying to manage on a daily basis.
We were also lucky that there was an ASD friendly MH nurse at CAMHS who referred us on to a psychiatrist who had been trained to do the DISCO.
Sorry hidden not really much help. Would Nottingham be accessible for you?
Google the Lorna Wing Centre.