What the hell is this insect?

Discovered in the kitchen, this is number two, number one got squished after it bit/stung.

It has two wings, they are translucent with a slight smoky band across them.

What am I?

Edit : Ok seriously impressed, posted it on : http://www.wildaboutbritain.co.uk/forums/insects/23791-wasp-ant-bug-help-please.html

Within 3 mins one of the members has possibly identified it as a spider hunting wasp, this was one of the possibilities for the one that got squished last night, googling for the specific variety suggested show pictures which look a bit like it, if it is one then I still suspect it is a juvenile and not fully grown, hence why it is walking everywhere and not flying around the glass 🙂