Qype User (.
Yelp
Excellent conference venue, next to the more modern and soulless QEII Centre. There is a small cafe inside, and a large number of chains (Costa, Starbucks, Cafe Nero) in VIctoria Street. It's further from Westminster Station than you think, so head for St James and walk down Tothill Street. Around lunchtime the local cafes and sandwich shops get very busy, so if you're at a conference, nip out for an early lunch, unless I'm speaking, of course.