Just an update on this.

In the email address that I originally thought was associated with the account (and one which they deny is linked to the account) I have found a number of emails.

The first, in 2014 was a welcome to my wallet email. This has the wallet ID which matches what i had written down.

There's another in 2017 asking me to verify the email (whether I did or not I have no idea)

Then there were two emails in late 2017 asking about attempted log ins from a mobile phone.

A final one was sent in 2018 regarding EDPR updates.


So I have sent another message to blockchain customer support.