I would check with your LE Indy if they do injectors and FIPS. It's a specialist job, so they may well send them off somewhere else and charge you for the privilege.landyfox.... Certainly one possibility is that the injectors are unable to flow sufficient fuel under load.... Will check the lift pump as that can be done myself... Then unless I have a blaze of inspiration I'll be putting it into my local independent landy garage to get them to check and rectify the injectors and pump if needed (will be going in there anyway for a routine cambelt change).... Would just like to exhaust the stuff I can do myself before I start paying their labour rates!!
You seem very knowledgeable, do you not fancy doing the cambelt change yourself?