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[jonathanh]

If I remember correctly the back Bermuda is about 60/70% efficient.  They are however very simple compared to the more efficient condensing boilers.

Almost certainly it’s repairable as said above here unless multiple faults and failure of expensive parts like the heat exchanger. 

If it is to be replaced then I’d support Dave’s view that a combi is likely to be easy fit.  Everyone has their own preferred manufacturer. Personally I have a vokera which some people don’t like but I find a nice piece of kit and better than a Worcester Bosch which has a lunatic design requiring loads of work if the prv fail. 

[dave the builder]

the last of the baxi bermudas was about 80% efficient
the only reason one would be un-fixable is if the tinwork etc is rotted away ,which can happen if the chimney leaks etc

[dave the builder]

if so many plumbers have been out and looked ,surely someone has said what's wrong with it 
what is not working ?

[TheBoy]

My Mum still has her 30yr old Baxi Bermuda boiler and fire. At the last service a few weeks ago the indy heating engineer said it was still in excellent condition and advised to carry on with it. Spares are still plentiful and cheap. 

Trouble is most of the Indys now just want to fit new. More profit.

[dave the builder]

There's also a big problem with the fact that many Plumbers are just that, they know how to fit pipes .
modern boilers like combi/system etc have complex safety systems and many sensors .
like a car ,part swapping till it works again can be expensive ,so proper diagnostics and tests are required .
and like a car ,just because it throws a fault code at you ,does not mean that that part is the fault .
so too many boilers are swapped for new ones because the plumber doesn't understand how they work .

and a corgi or gas safe logo on a van just means they might have been on an easy to pass course and pay a subscription ,not that they know SFA about fixing anything .

bit of a rant there  as with many services, there are good and bad tradesmen ,cowboys, part swappers and salesmen

[deviator]

For someone who's likely not going to benefit from decades of marginally cheaper heating from a new boiler to make their money back, the most sensible and quickest option is probably to repair what's there. It's likely just a thermocouple or gas valve that's died, after all, so an easy fix.

This. I 'fixed' the PiL's back boiler by running an airline from the compressor and blasting around the underside of the fire. Still working today. The problem is, my engineers don't want to fix anything, they just want to sell you a new system.