W Collins
I owe you a small apology, or at least correction. There is, of course a private 146 operated out of Biggin, which goes in and out on a regular basis. Because it parks on the East side, not the apron I forgot about it, but it taxied in today as I taxied out and I felt a small pang of guilt as it presented itself to my attention.
There aren't ANY privately owned jet's 'based' on Biggin Hill's apron, they all live as you say, on the East side in hangers (and South side for that matter) therefore you wouldn't know that there are infact 2 based BAE146's at Biggin Hill, as well as at least one GLF4, a F2TH, numerous LJ45's, LJ60's, LJ31's. The only reason why there are often jet's on the apron is when visiting jet's park overnight or are being 'turnt around'. As for 737's, there aren't any based there currently that I am aware of however it wasn't a million moons ago when there was. There would also be a A319 based there operating daily if the capatin of said Airbus hadn't witnessed a busy day!