tree bumblebee nest

How excited were we to find out that our new neighbours in the next box on the west facing wall of our house are tree bumblebees Bombus hypnorum! These have only been in the UK since 2001. The Bumblebee Conservation Trust are tracking where they are nesting so we sent them some photos. They are most interested in their northerly spread though as some indication of climate change. We have another bumblebee nest high up on the house on the other side (East facing) not sure which species are in there yet but will keep looking!