Hi shropshire lad, Its not a bumblebee I,ve come across but I did google it thou perhaps some one will correct me.. but I just checked a guide to Bumblebees of britain and Ireland and the closest one I could see to the one you Photographed was one of the brown bumblebees belonging to the family of Pascuorum which was alongside the family of hypnorum, Its one of the Common bumblebees, these two family of bumblebees were above 3 familys of Scarcer brown bumblebees which were .. Thuscorum, Humilis, and Sylvarun, Sylvarun look a lot darker in colour.. these are all proper family names of some of the species of bumblebee out there but I have listed here all the names listed in the guide for brown bumblebees.. I,m not sure if any of these Bees I,ve mentioned have simple names like tree bee for example something easier to remember personally thou I could Imagine overtime even family names become familiar if you deal with that species enough..
All the best Coal Tit.