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Yeah I mean 'a good thing' doesn't really sound like a requirement (and the solicitor is trying to make it sound like a requirement to force Hovic to do the work), i.e. even if the regs did apply to dwellings, it's unlikely they would be applied retrospectively (in this case) because some dwellings could never meet the spec for various boring reasons such as death by fire / local planning restrictions.
Whatever, any reason to tell them to do-one is good enough.
yes but not because of age - if it was actually required now, it might be a good thing to bring things up to regs - but that part of the regs doesn't apply to homes.