As I've been posting, I have had trouble with my car ever since a Garage fitted an engine and reconditioned PI kit. Thanks to the tremendous advice I have received on here, I got to the point where my car would idle at 950 RPM cold and around 1050 RPM hot, after blipping the throttle to get it to drop a bit! I then borrowed an inlet manifold setting tool, on trying to fit this, it was apparent that the three manifolds are not aligned at all well, I sent photographic evidence to the garage and my car is now back with them and they will refit the system once again.
Unfortunately, on stopping the car at their premises, the cooling system pressurised, it did the same yesterday, I now suspect the HG is on its way out, more expense. On the plus side, I have the head from my original engine and can use that in exchange, it also means I can junk the external oil feed I currently have to use to get round a blocked oilway. Now I just have to find a stage 2 head that's available in a reasonable timeframe.
Thanks to all of you who have given me advice with my problems thus far.