Stock cars / Bangers don't run weekly at Northampton. Sometimes they are on consecutive weekends, but usually there are 2 or 3 weeks between meetings.
Interestingly, I was watching interviews with F1 stock car drivers last night from the meeting held there last Saturday and they were commenting that there was more material on track than at the previous meeting.
One thing that should please everyone is that I am not seeing any complaints on here about the surface being rough last night, despite there being torrential rain mid-meeting on Saturday night. If there were going to be issues I would have expected them to show up after that.