a little over £1k(worth) in fuel at the ring and around 80laps -I had a season pass that year so we were'nt counting.
A couple of tanks to Hull and one additional fuel stop in Europe(again it was similar on returning) say around 300ish ltrs.

Hotel and cost of eating out etc isnt that expensive.
Ferry from Hull was around £280 if im remembering correctly based on 4folks & 1 car.