When I was checking with CAA last year about BFR's one concern they had was the airline pilot legally having a BFR in a B747 covering them for flying a C172 in the weekend. I tend to agree with them over that one, as the B747 never flys VFR and seldom if ever flys in uncontrolled airspace, and private flying and airline flying are as different as you can get.
I have always done a private BFR as well as the airline stuff as training is always a good start to flying safely.
