I live in Lancashire and definitely don't have a Lancashire accent. I have no idea what my accent is to be honest, it's some weird mishmash.
My severely autistic brother has a really 'posh' accent, even though my parents speak broad Lancashire.
As a young adult I was always asked where I was from and the people would be so confused when I said I was from the town we were in! Most often I would be told I sounded South African.
Reading about it and apparently it's common for autistic people to have a different accent to their peers and family and also for them to pick up other accents very quickly.