Did a bit more - in fact nearly another 2 hours and didn't seem to get that far.
Basically I got the pistons at TDC and got the cylinder head fully torqued down with the camshaft and rocker arms. How the heck did that take 2 hours?
It's always satisfying to see things going back together though and this gave me an opportunity to retorque the cylinder head whcih is always a good thing on these engines. The cylinder head nuts in the centre of the rocker shaft had to be done of course, but I still retorqued the cylinder head bolts which hadn't been touched and it was surprising that a couple of them "nipped" up.
Next step is to get the new timing chain and tenisioner on as well as fit the camshaft vernier sprocket after which I'll pause whilst I get my head round "timing in the cam" and will probably need Bryce's help on this anyway.