The plumber reappeared this morning and managed to get the rest of the water out of the system. He was then able to solder the joint that was causing all of the problems.
The system was then refilled and tested.
So for now everything is operational. The fun will come tomorrow when I speak to the insurance company and the company that originally resolved the problem.
Having been in the house for so long while waiting for the plumber and then while he resolved the problem we finally took Murphy to Micheldever Wood to see the bluebells.
Well that wasn't a standard weekend.