Underfloor heating regulations - EICR

It would certainly be better with local isolation and fusing - a fused spur from the ring would not raise an eyebrow.

The thermostat and the wiring down stream of it is unlikley to be rated for more than 10A or so, as larger areas of heated floor tend to be divided up into zones. So the question is could a credible fault do anything more than just perhaps fuse the thermostat contacts instead of operating the breaker.

The 1mm CPC is in that class,  the B32 will blow and the CPC will remain intact, but it may get hot enough to melt its way into the adjacent insulation on the live cores, so making a simple fault into one that requires a chunk of rewiring.

I think it is a judgement call, that depends on how it has been done, it sounds like it is certainly not dangerous, but if something is damaged, it may well lead to cascade failures that are more awkward to isolate  and harder to fix.  Recommend further investigation and could be improvemed, but safe for continued use.

It would certainly be better with local isolation and fusing - a fused spur from the ring would not raise an eyebrow.

The thermostat and the wiring down stream of it is unlikley to be rated for more than 10A or so, as larger areas of heated floor tend to be divided up into zones. So the question is could a credible fault do anything more than just perhaps fuse the thermostat contacts instead of operating the breaker.

The 1mm CPC is in that class,  the B32 will blow and the CPC will remain intact, but it may get hot enough to melt its way into the adjacent insulation on the live cores, so making a simple fault into one that requires a chunk of rewiring.

I think it is a judgement call, that depends on how it has been done, it sounds like it is certainly not dangerous, but if something is damaged, it may well lead to cascade failures that are more awkward to isolate  and harder to fix.  Recommend further investigation and could be improvemed, but safe for continued use.