Did you have a building agreement/contract with the builder?
Yes I do have a contract with the builder.
In answer to other questions if the washing machine was installed inproperly and caused damage, yes I would expect recourse to the installer ( the builder ).
If the washing machine just breaks down then no, similar to the boiler.
In repsonse to DreamerB:
Have you had the boiler examined? Yes
Do you know how much repairs will cost? No
Have you had it serviced more than the single time you mentioned in your first post? The boiler is new enough that it is soon to be due its 2nd service so it only has required one.
Have you checked if there's any manufacturer's warranty that's still in place? Its an install issue
Before you even contemplate any legal action, you need to identify the problem, who's responsible, and the basis - if any - on which you can hold them liable. I don't think you've done any of these things. I have.
So many defensive posts here for the builder.
I fully understand I need to show that the builders faulty workmanship casued the problem, thats a given.
I dont have to show it here, or convince you people, I have come here for advice on a mechanism for remedy.
So all further advice on what mechanism to persue is appreciated.
I would have no intention of engaging a solicitor so the small claims, if suitable is perfect.
thanks all so far again.