For your reference - the oil pressure should be bar/rpm:1,5/850 rpm.
If of course the pressures are ok on test , then you have worn hydraulic lifters that are not good enough to hold the oil / pressure - Renewal is the only answer then of those.. not a cheap / easy task Im afraid - I cant tell you prices as garages charge differently all around the UK - I would advise if it comes to this ( and for an oil pump change if its that ) to ring around and get prices - you can save a lot of money that way.
So those are the ways forward on this now to get this sorted for you.
Thanks for that Mike. Much as I expected re diagnosis. Was not aware it was a common problem with that type of engine though.
I will get an oil pressure test done but I suspect it will be ok.
I hope it is the pump as I can change that myself. Got to keep costs down as car aint worth a major repair bill.
If it is down to the lifters is it safe to drive the car once the rattly noise has stopped ie the lifters are up to pressure and operating ok??
Just 1 last queery.
Can I change lifters with the cylinder head in situ.
I am a pretty proficient DIY ER and removing and refitting the cams does not faze me.
I have a haynes manual and it is not clear if The lifters can be removed with the cylinder head fitted