My double room, 2 evening meals for 2 people, drinks for me and Laura, plus 2 rounds of Flaming Sambuccas (12 of) came to 372 Euros (about £350.00)
Petrol wise, I filled up 3 times. so about £160.00
Ferry @ £30.00 ( I got an early deal)
So, if you went on your own you are looking at £500.00 for the above. If you go with a wingman in the car, who shares the costs, then you can obviously halve the cost. So obviously £250.00 each.
The 4 lap ring ticket was 75 Euros (£70.00)
We had one meal away from the hotel, which was 26 euros per head (£24.00)
Then with the other odds and ends, a couple of pizza's and odd beers here and there. T shirts, ring stickers etc, which is as much as you want to spend.
So, to sum up. It cost me about £750.00 in total, £375.00 per head for me and Laura. It won't change much by this time next year I imagine.
Hope that helps.