The UK Space Design Competition 2013 is open to all UK secondary school students in years 9-13. Teams must consist of between 8 and 12 students, plus a supervising adult, but need not be affiliated with any particular institution. This means that schools, colleges, science clubs, and societies are all free to enter a team, provided that the above criteria are satisfied. All team members must be specified in the initial application.
Check out http://uksdc.org for details!