And now for some good news: Sleeman have delivered a new set of undersize bearings and a couple of the felt seals for the bottom end.
I'm pretty close to CMES, so they're going to get the grinding job. While I'm at it, I will wire brush all of the old flakey paint off the outside of the block, then get them to put it through their parts washer. Assembly will be easier with a nice clean block, and it will take paint rather more easily!
I've found the bolt holding the cam in, will hopefully have time next weekend to get it all ready for machining.