Lane; thank you very much! That is EXACTLY what I wanted!
From a quick look it is consistent with the Rolls Royce Heritage trust document but with the actual structure and plumbing. The second diagram appears to show the whole thing pre-hole and the first where to drill the hole. Fantastic!
I will take a good look at it all however and work out if I need to edit the original post. At first glance it appears that pre hole, the "leak" is introduced from the pressure to the supply side of the supercharger thus maintaining a closed system. With hole it appears there is a possibility of fuel-air venting to atmosphere when you are using combat +12psi boost.
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