An update on my issues.
The boiler has now been replaced. There is apparently some shortage of Vaillant boilers at present and my plumber's suppliers gave him the run-around with them being impossible to obtain, long waiting lists etc etc. I went online and a few days later the new boiler was delivered.
Cost so far: £1,400 or so.
What is supplied doesn't include a flue fitting and a few other essential bits; my guy also fitted a pressure release valve between the c/h and hot water circuits, and gave the system yet another flush. The extra bits plus one day's labour came to £1,140.
Total cost: £2,540.
What had killed the old boiler was a near-complete blockage near the boiler itself, which flushing the radiators had probably caused or worsened.
I compared the bills to the cost in 2008 for a boiler replacement, in the house I rent out: £3,018. The cost to replace the boiler here in 2010: £2550. It seems this time I have done OK, allowing for inflation.
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