We are used to our neighbours bees swarming in early summer (late May onwards) but they caught us out this time by being far earlier than usual. I noticed one swarm starting but it had moved on from the original roost so I had to go find it again. They had regrouped on a hedge on top of a steep bank. However on closer inspection (with binoc's!) there were two swarms about a metre apart which I hadn't come across before.