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Really not sure about this identification - it could be B. pratorum, but the tail was quite extensive, and the bee was much bigger than any queen B. pratorum I have ever seen - similar in size to B. hortorum queen.
Looking at the ID guide, I would be inclined to say B pratorum, but I may be wrong!
I think there is no doubt about this - it is pratorum, which always has a 'broken belt' in the queen, far more so than soroeensis does. Comparison with B. hortorum queens is not helpful because hortorum queens are notoriously variable in size, from huge to tiny. You would not expect soroeensis queens in Scotland to appear until June, and I have never seen one with a tail this colour - usually they are white, with maybe a bit of reddish at the base. Males more often have wholly red tails.
recording wildlife with The Recorder's Year on www.hbrg.org.uk/TRY.html.
Thanks Syrphus - I was thrown by the large size, and very extensive tail. I'm used to seeing smaller pratorum queens with red tails that are very 'short', so thought it may be a variation of soroeensis.
Lat/Lng: 56.121323, -3.946197
OS grid ref: NS791937