Osprey or Buzzard?

We where by Bristol Airport, on the way there, a very large bird was seen flying, It had seagull shaped wings and soared. The tail wasn't thin but not wide too, It's wingspan I would say was about: 1.4 or 1.5, Now I have seen a Buzzard and Osprey before at Bristol airport. I've seen a buzzard here before on the way to a RSPB Reserve (Ham Wall) I've also seen two ospreys sitting down by the Airport (coming back from Ham Wall).