I found this on one of the windows round my flat in early September.
Never seen anything like this here before, not a clue where to start looking for an ID, so over to you clever lot.
Now identified by @mummmymonkey and @Rother Birder in the Insect Forum (and on here) as a Caddisfly. I'd never have got there. Interesting though... I did think the eyes reminded me of shrimps.