I noticed today in Craiglockart Dell along the Water of Leith that the teasels were literally buzzing with bees and hoverflies. Almost all the hoverflies were Epistrophe grossulariae (which as far as I know doesn't have a common name). These two posed nicely for me:
Today I was also delighted to receive my copy of Britain's Hoverflies, which I finally got round to ordering a few days ago! It looks to be an excellent guide to this interesting group of insects.