![Image](http://www.photomacrography.net/forum/userpix/390_2007070804_1.jpg)
It's obviously a fly (I think when I first spotted it I thought it was a wasp due to the 'waisted' shape) - the small yellow blob is a haltare, quite obvious on the specimen I have. The eyes appear a shade of blue in the close ups, which I will post over in technical in a day or two!!
Any thoughts as to the genus? I've not got much in the way of fly books, apart from hoverflies and a few general insect guides, which usually feature little in the way of flies outside of commonly seen ones around the house and hoverflies..