I took a look at few documents I had handy for production numbers. These are only estimates but close.
Series 1 Production = 2000
DHC Production = 767
Aero Production = 994
Rover Engined Plus 8 Production = 6000
F Super Production = 180
Plus 4 Production 4584 (Subtract DHC overlap)= 4500
Just these total some 14441. And, it doesnt address most Three Wheelers, the New M3W, the Series 2-5 4/4s, the New Plus 8s. The Roadsters, etc.
Cheers,