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My reference books are all stored away as the house is stripped to allow the whole central heating system to be replaced. So, I'm currently unable to ID this insect which when I first spotted it, I thought it was a fine example of impressive voluchella (?sp.) but, I do not think it is that species which I have often seen in my small back garden. Most of the plates in my copy of The Flies of the British Isles I am familiar with but, my memory cannot recall one which looks like this species. So, anyone able to ID this fly for me please.... I'd really like to know what it is. The large head with the distinctive yellow central area is strikingly noticeable.