As a hard working scientist it is important to get the work life balance correct. There is loads of interesting stuff to do socially in London. both throguh the university and external to the university.
Students Union Clubs and Societies:
Member of staff UCL have access to all that goes on at both UCLU and ULU.
List of UCLU activities
List of ULU activities
Entrepreneurship Activities and Competitions
Biotechnology Yes competition (http://www.biotechnologyyes.co.uk)