Is This Compliant?

I assumed the tails are 16 mm twin and earth cable.

Nope Sparkingchip, just single insulated tails inside and outside the fuse box.

The whole installation used to be earthed onto the water pipe as far as we can tell. Ze was off the scale when tested. No R.C.D. Suspended wooden floor. New meter and isolator. Many circuits over fused. But no fires or shocks reported. TT earthed.

Now fully updated with a new consumer unit etc.

Z.

.

Single insulated tails connected up to new isolator.

Single insulated tails connected up to new isolator.