There have been relatively few insects round here (South-East London / North West Kent) this year and very few wasps. Also come to that a vast reduction in Blue Tits, Great Tits and other wild birds.

I put that down to the extremely long and bitter winter we had

On the Blandford Fly the Telegraph says -
The Blandford fly, a tiny insect normally found in the country, appears to have reproduced in city areas, largely thanks to the growing popularity of garden water features.

Experts blamed the recent warm and humid (sic) which has made insects, including horseflies, mosquitoes and midges, more active, particularly in the evening.

The balmy summer evenings have also encouraged people into their gardens where they are more likely to be bittenExperts blamed the recent warm and humid which has made insects, including horseflies, mosquitoes and midges, more active, particularly in the evening.
The balmy summer evenings have also encouraged people into their gardens where they are more likely to be bitten, the Daily Mail reported.

Not a word about foxes although I feel sure you are about to show me one :-)