This is beyond a joke. I appreciate I'll get berated for being "over-sensitive" and assured and reassured that I'm in the minority. Thanks in advance for all of that.
Frankly, a substantial proportion of lounge staff at Heathrow lack:
1. Common courtesy
2. The most basic of manners
3. Any knowledge regarding basic rules of admission and refusal to lounges
4. An absurd inability to apologise when making an error, nor an ability to learn from it
All in all, this ought to a matter of embarrassment for BA, not least as it primarily affects customers in their premium cabins, and those frequent travellers.
Note - there are a number of excellent lounge staff at Heathrow. I can only imagine they must be deeply frustrated with their colleagues.