*A rule is to show the card to the Lounge Rep (we do not call these nice folks 'Lounge Dragons'
) - I think BA introduced the same policy same time ago...
Except at the least BA don't enforce it very often: I can't remember the last time I was asked for my EC card either in EDI or in the lounges here in T5 (or at any other outstation come to think of it). There was a time a year or two ago that they asked on entry to the lounges Heathrow; I haven't been asked for a while.
The BMI lounge dr...lady wasn't questioning my right to access - she was just looking for the correct think to write on her list. I was also travelling on a Business UK ticket so I should have access to the lounge even without a relevant EC card.