I had the same thing last year, I thought they were wasps, so I called the council pest control,the lady that came told me they were bees and had to be left alone and that they would be gone by September, which they were.

Is it possible to move the bin out of harms way?

If needs be contact your local bee keeper he /she might be able to help you, if they remove it they might charge you a small fee as they will dispose of it into their own hives ..

I had this problem myself and it was in a front hedge and my local beekeeper came and removed it for me before any one got stung by the bees

I too had bees in my compost, if left alone they will happily nest. Sometimes too they die out, which is sad, if you can I would leave them and they will be gone before you know it. just tell the kids to keep away. When they have gone, stir your compost up and keep it damp. We really need to take care of our bees.

Thanks to booboosmur, hjuju and grandmage. I'll barricade the footballers out til September then.

As you say they are bumble bees and not honey bees, they will leave the nest eventually and they are such a lovely insect so do try to save them.