Despite the mini taking another set back, and thanks to the awful weather and early dark I've been able to start a bit more on the Riley. Putting the 16 year old son in charge of mini engine removal in the aformentioned wet and wind has also helped a bit
Anyway, despite several months of various concoctions of wd40, diesel, engine oil etc being added to the bores, attempts at rocking the rear wheels back and forth while in gear and the back end jacked up, despite jumping on the cranking handle and swearing at the block, and despite several contemplative ciggies staring at the thing in an effort to free it with mind over matter

the engine has stood firm and refused to budge from its long time resting position.
So, as the front end is off the car its a good time to see if the engine shows promise, or if it will need to be pulled which may as well happen while I'm at this stage.
So off with the head, this is actually a bit of a pain, with ancillaries off and with all the head bolts undone the head refuses to go anywhere above a couple of mm up from the block. The reason for this is the two hot spot tubes running through the engine block from exhaust manifold to inlet manifold, all designed to warm the engine up quickly and apparently more harm than good.
With inlet and exhaust manifold off ( almost every exhaust stud snapped in process) the tubes come out with the exhaust manifold and the head comes off.
Call me rough if you wish, but with nothing to lose a whittled down fence post fits down the bores, a couple of light taps to each piston crown sees a fraction of movement on the crank handle, another couple and the thing frees up.
The two holes you see in the side of the block at the centre are the hot spot tube passages.
The bores are good with no wear, pistons are standard size and all feels well, Im a little concerned about some deterioration around the water passages of the block but hopefull theres enough good meat left to get a good seal with the gasket. I think some Hylomar blue may help with that.....
So, the plan is to re-assemble and try it, if it seems o.k then I'll see how it goes. The odd head stud is due to the head studs sitting in the water ways, which stuffed the threads in the block at that one so I resorted to a helicoil.
A new old stock head gasket is on its way from Ebay, for half of the £82.50 plus vat

quoted elsewhere
Snapped exhaust manifold studs are also out of the head, I welded nuts on them and the heat freed them up enough to be undone, Hot spot tubes have been removed from the manifold and the manifold plugged at these points as they serve no purpose in these days of antifreeze and are just a legacy from the engine design of the 1920's and are reckoned to cause overheating of the back two cylinders.
So when the head gasket gets here we'll see how it goes...fingers crossed.