What to expect while I'm in London?

Yeah it will be really cold in winter in London so I would bring your leather jackets but apart from the cold issue just chill in your casual style. London is a great place, go to Piccadilly Circus and check out Topshop on Oxford Street. Also you could go see a show in the theatre if you're into musicals and also do the whole tourist thing like go around on a sightseeing bus and visit big Ben and the cathedral where William and Kate got married. Also visit Buckingham Palace! Have fun!