About initials

The recent BBC coverage of the 50th anniversary of the (partial) decriminalisation of male homosexuality has offered a number of variants on the modish label for those whose sexual and/or gender identity is at variance to the norm; most agree on LGBT, but then they go off in a number of different directions, deploying various combinations of Q, I and A, and disagreeing on what they mean. I am therefore grateful – and not for the first time – to our friends in Canada for letting us know exactly how to define lovers of musical theatre/ladies in sensible shoes: