Sorted!!!!!

After spending countless hrs and buying 2 fuel regulators (one FSE one 2wd..now spares) turns out the oil leak round spark plugs 1&2 was causing the misfire and the reduction in fuel pressure was diagnosed as the cause, when it was in fact the effect!

Today i rigged the fuel pressure gauge so i could see it whilst driving (no bonnet on) and all seemed fine. Took plugs out to do a compression test and noticed ton of oil round plug 2 electrodude. Claenaed it up put some redex down to clear the piston...test drive ..job done!

Hrs of pain caused by an ill fitting rocker gasket which was 'professonally fitted' by a garage!

thanks for all suggestions