We normally tanker fuel on a flight to Jersey, although because of the performance considerations of the short runway at Jersey it is sometimes not possible (Boeing 737).
I happened to fly a LGW-JER-LGW a few days ago.
Fuel burnt on way to JER was 1400Kg, on way back 1600Kg.
We obviously carry a lot more than that for contingencies, diversion fuel, taxi fuel and our reserve fuel that we plan to never ever use unless things really aren't going our way.
The fuel we carried for the JER-LGW sector was 4400Kg, well up on the basic 1600Kg flight fuel!
(these figures are for a half load of pax on a 737-500)
