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Thanks for all the advice. Does anyone know how long it might take an engineer to actually replace a primary heat exchanger on this boiler.

Thanks - that's very interesting. One final question... The Vaillant engineer was in our house for no more than 15-20 minutes before explaining what he found to me. I wonder if it is possible to diagnose an electrical fault with the PCB and do this damage to the heat exchanger (presumably by...

The PCB on our 3 year old boiler failed last week. The Vaillant engineer has visited and diagnosed this fault but noticed a bolt missing from the heat exchanger. He also noticed the seal was changed at the last service a few months ago to a graphite seal. No-one has touched the boiler since this...