I read that you did so we've just rang and told them. No extra charge. Customer service said best to tell them everything.
Friend said I was being daft it's only hrt patches. Am glad I did ring. Like I said to dh if I got a blood clot abroad and didn't tell them then it could make the policy void. Blood clots obviously being a possible side effect of hrt. Although it would more likely be a flight causing a blood clot.