London vibrates almost as much at night as it does during the day. Night Life activities you can particpate in London.
There are many expat meeting spots in London. All Star Lanes in Bloomsbury (http://www.allstarlanes.co.uk) has an American theme but locals and expats alike are more than welcome! If you want to meet other expats check online for expat groups.
The Meetup site (http://www.meetup.com) is definitely a good starting point. You will find groups to ‘meetup’ for whatever interests you – whether that be dogs or tennis. If your particular interest isn’t there, start your own group and meet people.
Time Out (http://www.timeout.com/london) and Beer in the Evening (http://www.beerintheevening.com) can help you find the most happening bars, pubs, and cafes in the capital. Joining a social networking site like Facebook will also help you get in the loop when it comes to finding the hottest parties or venues where you might meet like-minded people.