TMV valve problems (lack of them!)

I have just had what should purportedly have been a high class refurbishment/conversion ( costing some 750K) in an existing building. In one of the baths and at all sinks through the property there are no TMV valves. The builder (much has gone wrong with the plumbing) is now relying that under Water Regulaitions TMVs only have to be fitted in New Builds. Indeed I have checked this and this is correct. However, the contractors DID place one TMV on top of the water cylinder which has made no difference at all to the generally heat of the water throughout the apartment. My question in the circumstances (I do not want to be accused of asking a leading question) is what would the majority of good quality Plumbers do whilst working on a high quality refurbishment/conversion and not a New Build. Would they put TMVs everywhere or use the Water Regulation Rules not to install TMVs. Thank you and I look forward to receiving your responses.