Accomodation
I had a look into the accomodation subject. If you need a room, Premier Inn in Wellingborough is booked out for Saturday night. You can only get a room there if you stay two nights.
http://www.premierinn.com/en/hotel/W...rough?cmp=GLBC
Another option would be the Ibis in Wellingborough. Rooms for Saturday are still available there. We stayed there once with the P1WOC and it was quite nice. There is also a pub nearby, the Priory.
http://www.ibishotel.com/gb/hotel-31...h/index.shtml: