Thanks again to all those who have replied.

As I said the head wasn't planed to correct any warpage however the head was resurfaced, the car had a blown head gasket and there was some minor marking around cylinder #1. In addition new guides and seals were fitted and a vavle grind was done.

I have run a bottle of lifter free through it already and after having done 1000km's they are much better but still clatter for 30 seconds or so on startup after the motor has been sitting for a while.

I wasn't aware that the rockers had to be changed at the same time as changing the compensators, I can understand if the rocker face is worn or ensuring the compensators stay paired with the original rocker but do they need to be replaced when fitting new compensators?

Cheers
Matt.