Northamptonshire County Council's website has details about the formalities needed for a marriage to take place including a list of civil wedding venues, information about marriage licences and registering, and details about the ceremony itself.
For more details contact the Registery Office:
Corby Registration Office
Level 2, The Corby Cube
Corby, NN17 1QG
Tel: 0300 126 1000 (Mom - Fri 8:00am - 6:00pm)