Lolly,
their details are on the caravan club website :
Here (I just realised you have to be a member to view the info)
Northamptonshire and Rutland
Mrs Anita Sanders
01933 402182
Website : http://www.northantsrutlandcc.org/
I live in Rushden, and as many of the commitee seem to be based around wellingborough, mant of their events are held around there.