Email arrived recently from BAC:

"Your account has been locked
In line with most major companies operating a financial awards and incentive loyalty programme, we constantly review transactions across our British Airways Club database to ensure compliance with the programmes terms and conditions, and to protect our members.
This process has highlighted some anomalies with your account, so for your protection we have locked your account while we investigate.
We will be in touch with you again shortly – normally within two weeks.
Thank you for your patience.
With best wishes,
The British Airways Club team"


My best guess is this has come from a recent email address change I made, though I did also make some HHA changes a couple of months prior too.

Their predicted time of 2 weeks was almost a month ago now - does anyone know a more accurate timeframe for me to hear anything back? I presume there's nothing I can do beyond sit and wait.