Thanks - I hadn't realised there isn't even some minimal form you can submit and get generic responses on. I just tested the recovery process (https://accounts.google.com/signin/recovery).
If you don't have enough information for them to reset, Google just provide links to instructions to not be locked out in future, and to create a new account.
The problem is I have the phone number, recovery keys and recovery email, I can provide more info if needed, this is not enough for Google to return my Gmail.
Right now I am using mail that is on my domian name, so I can back up my stuff and go at any time.
I lost my Gmail account five years ago, and I still do not have access to it.