BSA frame number

[glenorchil]

I picked up what looks like an early 80's BSA road bike, but have had trouble trying to properly ID the frame etc, the number looks like
NP5099831
which is on the back of the seat tube, any hints or links folks ?

 

[COUPES]

Re:

Raleigh BSA, Nottingham made, P November? 1985.

Simon

 

[glenorchil]

Re:

Cheers Simon, nice one