Well I've made a start. Thought I'd get it going and stopping first. Fairly important I thought.
Stopped the first and only time I ran it (after trying to get it started for some time) and couldn't get it going again. Seemed to be some fuel and oil under the fuel pump, and the carby has been uncovered for quite some time so I assume full of gunk. Also the water leakage. Didn't like brown all over the place.

Well after 3 attempts got the new water pump in and working. PS, replacement pumps don't always perfectly line up. Had to cut my own gasket for the thermostat. Could only get one bolt in. Had to file away a few mm off the bottom to get it to fit, then after putting everything back in, it leaked when filled. Remove it all again and took off the backing plate (which was already assembled), put sealer in there also, reinstalled everything and finally, all ok. Thought I'd also disconnect the after market heater for the time being. All up the whole job only took 5 hours !!!!

Well the next day moved onto the Fuel pump and carby. No fuel showing in the bowl, but it was in the tank. The line from the fuel pump to the carby is not original, think its off a 186, doesn't quite fit as you can see in the photos (was also in the way of the thermostat), and was pretty badly butchered. Cleaned it all up, replaced the fuel bowl cork gasket, and it finally filled the bowl. Didn't want to mess with the Carby too much, so blasted it with carby cleaner. Chrome fan and housing look OK.
Finally it's running !!!!!!! Not real well (coughs and splutters and backfires through the carby, but its going, and I'll work on it from there).

Had a bit of time left, so started on the rear brakes. Fluid leaking down the inside of both rear wheels, so I knew the cylinders were shot.
I remembered it was hard to get the springs off, but getting them on again was a major effort. This is the before photo.

Well one wheel done, and one to go. Tomorrow is another day.
Slow but steady, and lots still to be done.