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I don't think anyone would be 100% certain of this one, but I see nothing that would make it terrestris rather than lucorum group.
I agree with Mydaea. In fact, I think I can see a black "nick" in the yellow collar on the shoulder area which suggests B. cryptarum, one of the B. lucorum complex.
Oh well. I was trying to ID this from the BBCT website info - obviously not making a good fist of it yet! I have a couple of other pics of this individual, but both are pretty much profile only - the one posted was the best quality. I presume the 'nick' mentioned is where the wing joins the body?
Is the BBCT website-based guide worth bothering with, or am I better off looking for something else?
Thanks for the comments though...
Flickr pics: http://www.flickr.com/photos/72243477@N00/
The BBCT guide is OK for a real beginner. If you aim to get serious about Bombus identification, you need to get a much more technical key.
See also the BWARS species pages:
The Natural History Museum's key to Bombus:
and Steve Falk's Bombus set on Flickr:
For books I'd recommend either of these:
Field Guide to the Bumblebees of Great Britain and Ireland by Mike Edwards and Martin Jenner (Ocelli Ltd)
Bumblebees (3rd edition) by Oliver Prys-Jones and Sarah Corbet (Pelagic Publishing)
Entomologist and biological recorder
Lat/Lng: 54.235, -4.4071
OS grid ref: SC432848