OK - bit of an update:-
1. K-Tec state the valve spring seats do not require relieving with uprated springs.
2. CatCams state the valve spring seats do not require relieving with uprated springs.
3. I've measured a 10mm lift and I still have about 1.5mm - 2mm of free travel left n the spring.
The cam turned up and looks fab, aparently the new CatCams 285 is optimised and now timed in @ 113 deg as per
https://www.rtoc.org/files/Miscellane...t%20Cam285.pdf
Head has gone off for checking as it was weeping a little from the front edge
Crank and flywheel off to be balanced and the main end journals cleaned up.
That's it - 2-3 weeks wait for this, got to say, I've found another great engineer, well respected in the mini 7's and Miglia race scene TMW Engineers if you need HQ stuff.
In the mean time, I'll be fitting my liners after de-glazing.