He wasn't necessarily a conman, he just diagnosed the fault incorrectly. There isn't much joy working on 'hobby' projects for customers. Parts aren't easy to get for these units, very easy to end up with unproductive time. Which is no doubt what the 'so called Corgi' thought when you told him to come back 'and sort out' your obsolete basket case for nothing.
A boiler service isn't a guarantee of no further faults for a year, its just routine (and I mean routine, as in manufacturer schedule) maintenance.
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