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.
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.