On 27/05/2015 14:10, GB wrote:


I did wonder whether the cable is overspecified to allow for this.

No it isn't in a 2.5 mm2 circuit.

There must be loads of ring mains with breaks or dodgy connections,
but the number of electrical fires is fairly small.

They are small numbers in all the modern wiring systems.
Radials don't catch fire often either.