Just an update on the problems.
Problem 1 Losing Power. In the dizzy one of the modules has broken down. Apparently this is quite common in the heat. Only way to fix is replace the dizzy.
Problem 2. No Start. Appears to be the starter motor. Will replace today hopefully. Bought one from the wreckers only to find that it was from an auto and they are different from manual.

I checked the 12v supply to the solenoid with the key turned and it is getting supply so the starter solenoid must be faulty.