No worries mate, in fact it was useful for me, you see my numbers are:
Frame: 1021123, and
Engine: 1021246.
Anyway, Steve K0 thought that this was too wide a spread of numbers (123 between frame and engine) and might have been a case of the engine is not being the original, even though I have the original title.
So it's reassured me that in fact my bike is original in that regard, considering that your frame and engine numbers (from a bike that you know is definitely original) are maybe as much as 300 numbers apart? Thanks!
Hahndy's numbers make sense regarding the "double cut" fender and wrinkle tank, if the sandcasts stopped at 7500, then a 9000 bike like his is a very, very, early diecast, and so you'd expect a lot of left over sandcast parts like double cut fenders and wrinkle tanks being fitted, but by the time yours came along 7000 bikes later, those sandcast parts were running out, I guess? Cheers, Terry.