It's an awfully BIG question and might take ages to answer.
If you say why you need to know or what the specific problem is you will be more likely to get a sensible reply.
If you still have the installation documents they will have wiring diagrams.
Is it not a 19-24 rather than a 9/24 as you say?
Q how is a worcester 9/24 combi boiler wired in?
A Fused and switched spur to ring main
see what I mean?
Peccavi, January 2009
