In DOH this morning on the BA122 there was an announcement that Boarding would be by group number.
After “families with children under 5” was announced, this was followed by Group 0 and about 10 seconds later by Group 1.
Then, separately, “Business Class” was announced (?!) and as a Silver in Group 2, dutifully waiting, I leapt to my feet and boarded with Group 1 although Group 2 was then announced moments later.