Wardair - I never saw it but their single 727 apparently spent a lot of time in Europe.
As someone else above has said, it operated into LGW, I saw it there on a few occasions back in the day. It 'might' also have done rotations to Lahr in Germany to ferry RCAF families/visitors through Gatwick back to Canada.
I flew in Hapag-Lloyd and Condor 727's from Germany to the Canary Islands and they always seemed to be very spick and span compared to other airlines.