Can anyone help me find a site in Northampton?

I'm based in Leeds but about to be offered a 3 month contract in Northampton. I have a motorhome and will need to stay in the vehicle for approx 3 nights a week. I don't want to move the vehicle back and forth from Leeds, rather my hope is to use my motorhome more as a static caravan. I have family comittments that means I have to be back home at weekends ect, and hope to use my car to travel to / fro from home to Northampton. Can  anyone suggest a site near to Northampton as I can't find anything. Many Thanks.