Pontius Navigator: I did Google and came up with similar numbers to you.
RAF May 1st 1945 total strength 1,079,835; and 9,200 aircraft.
1st April 2009 total strength 39,600.
What I could not find out was the total number of aircraft as at 1st April 2009, and I suppose if I were to ask for it here someone will shout Beadwindow.
Using my numbers the RAF now has only about 3.7% of the 1945 strength, whereas the RNZAF has about 4.5%.