Mostly bees

Loads of them around the garden today, one in particular, not seen before. I have been trying to find out what it is, appears to be a red-tailed bumble, but they give the size of it as 30mm for a Queen, and 20mm for the male. Well the male has a white bar on it, which mine clearly doesn't, and it was tiny, tiny, only 10mm. Also a pair of really ugly flies, never seen these before, and the strange bee again, which I can find no id on. Saw lots of these at the park today too.