After making several attempts to clean the broken parts and epoxy them back together (all failures) I explored the depth of the remaining hole in the crankcase.  I put a long screw into in and turned the engine over to make sure no moving part fouled it.

Then I had a hunt through a spares box and found an M8 machine screw that could be gently screwed into the hole. This almost sealed it, and after the application of some sealant, succeeded in sealing it completely.

I could run the engine without losing oil, now, but had no oil pressure alarm. Which was fine, for getting us home.

The trip to Corpach and back up the canal was quick and almost uneventful. Angus met me in Corpach to help with ropes in the locks (the canal won't let single-handers transit the long flights this year).

The 'almost' needs qualification:

- The outboard decided not to start. This turned out to be an oiled plug, but I didn't have the right size of spark plug spanner to discover this until after we got home.

- The pickup line had wound itself round the mooring chain in Findhorn, and it took some ingenuity to get it unwound. We spent our last night on the boat lying to a couple of ropes lassoed around the mooring bouy, but got it all untangled in the morning.