Thank you everybody for your help here.

Going to the ICO website suggests my first step is a formal complaint to British Airways. It appears the email is [email protected] . Once done, and response received a complaint through the ICO seems more apparent.

I shall do that tonight, and indeed reach back to the auditor expressing concern about the remedy and indeed ask for the removal of the incorrect email. Hopefully he will not want me to actually create a new email account with another provider (!).

No point pursuing Customer Relations just yet, is there? Telling me it is fixed when it wasn't, coupled with the auditors approach has me a tad mad!

Thanks all again.