Update.
New shells are here.
New pistons are in the UK, should be coated soon by
http://www.dlcuk.co.uk/index2.html
I've blagged a burette from Glos Uni(Cheers Loz)
Next step:-
Get the block bored,
Dummy build
Calculate amount to be machined off the block to reach desired compression ratio
Machine block and re 'O' ring
Clean
Re-build
Enjoy
But at the moment
Tick follow tock.......