When I used the place a few years back the fuel was the cheapest for miles around and if I landed with minimumum divertion fuel (about an hour) I found that I coulld save enough on the fuel uplift ( about 150lts) to pay the landing fee.
This statment is based on the north London fuel price at the time but I think it is worth giving Shell a call to check the curent price, I also found that if you wanted a quick turnaround give Shell an ETA and they will try to have the fuel truck waiting for you.