Not great progress as the valve spring compressor didn't fit
I did get my two new rockers (thanks Blue) swapped for the two damaged ones. This was a struggle as the shafts are slightly ovalled where some of the clamps fit due to over-tightening (most likely by me).
I had to heat the rockers to get them off! I corrected the end of one shaft in the vice, not ideal practice I know but it was only a few thou and I was very gentle

The new rocker slid on so easily Scarlett did it!
We took the studs out aswell. Some were loose, some needed the two-nuts trick which Scarlett was well impressed with
I'm on the lookout for a longer reach compressor now, as well as a pressure measuring device...
No-one will believe you...