I saw this on a small apple tree. It was there for about 12 hours.
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abundant this year - or at least very obliging to iSpot contributors! Your photo is one of the best of the bunch.
Wikipedia has a good short article on them at http://en.wikipedia.org/wiki/Bombylius_major
if you want to know more.
Lat/Lng: 51.9, -2.2
OS grid ref: SO9032