The airport have taken fuel in-house, and are soon to raise the price by 30p per litre, which I believe puts them around mid-table when compared with other UK airports and airfields (so not by any means expensive, but previously, they were one of the cheapest).
Naturally, this has caused a bit of worry amongst GA at the airport, with a couple of operators anticipating an additional expense in the lower five-figure region!! Given how delicate aviation can be, it's not hard to imagine a scenario where such an expense could threaten the viability of a business.
I think other north-east airfields may now be more competitive, and when you're uplifting 200+ litres at a time, it makes sense to make a purpose flight elsewhere just for fuel, so any gain in profit the airport hoped to make is already gone!
With oil prices still generally decreasing, and the mandatory handling still being in place, this has the potential to undermine all the good work the airport has done over the last year to improve GA at the airport!!