Crikey, those flights are a blast from the past!
Yes, British World operated them for some time but I'm sure I recall European taking over Hanover for a year or two until Air Berlin started up and of course Bruggen closed down as a base.
Thats got me reminiscing. STN also had the oil flights to Hassi Massaoud for a few years, again British World. There was also a private oil charter to Uralsk, I think with Eurofly and Malev. Anyone remember them? Both went off to Gatwick I think. There were often very few pax on the flights so on a per person basis tickets must have cost the charterers a bomb! I recall being parked next to the A310 of the Algerian airline taking Hassi on at LGW who's name escapes me and no more than 20 got off!