Darren,
Looks like Dotted Bee-fly,
Bombylius discolor, to me - well done for finding it, I'm very jealous!
It's a rare species, so would be good to send the details in to the recording scheme:
Simon Hayhow, Larger Brachycera Recording Scheme, 2 Dreelside, Anstruther, Fife, Scotland KY10 3EF; or e-mail:
simon AT scotfishmuseum.org
Great photo as well, and another insect that is out early this year.
Martin
Martin Harvey
Buckinghamshire and Milton Keynes Environmental Records Centre