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Magaan, mydaea's comment is a bit cryptic so you may not know that you should act upon his suggestion of B.cryptarum.
However, I believe it might be a simple Buff Tailed Bumble Bee (Bombus terrestris) seen in pictures here
Like me, you will probably bee (got it?) surprised to discover that it's not easy. The colour wears off, they come in three versions and some need a specialist to ID! Simple eh?
Anyway, if you spend time at the website I've given you will learn more than I know!
When you think you have it, simply add an ID to your posting and don't worry if it's not quite right.
Don't get me wrong though it COULD be B.cryptarum. You should read this -
http://www.ispot.org.uk/node/115886 and the comments.
Oh, otherwise, good luck.
Lat/Lng: 51.9485, -0.5324
OS grid ref: TL009287