The gas fire also needs repairs and can't be used until the engineer comes back on Thursday, but that can be repaired. We therefore had a long session with a different person from the gas company yesterday and have now arranged a new boiler, installation date yet to be arranged.
The old boiler was almost 30 years old and nothing lasts forever, so investing in a new one will make the house much cosier. Fortunately we have enough savings that the money will not be a problem, but of course it will be a pretty big job and a lot of disruption, which neither of us like but it can't be helped.
So today I am doing nothing much. Just relaxing and calming down after all the intensive activity over the weekend and yesterday.