An Update.

After further calls this morning with no luck I decided to PM the BA Executive Club contact here on FT.

Within an hour os so one of her colleagues called me on the contact number I provided and was able to make the booking happen with no issues about card billing address or anything else, so obviously this condition can be waived under certain circumstances.

Just a note to say well done to BA Executive Club for passing on my details and to the BAEC agent who called me to resolve the issue. ^^

All now resolved.