I wouldnt bother, your wasting your time.
Western power AKA Eon, in birmingham, TNS, old cable head, open top funnel type tared in, with separate inline fuse. tar showing signs of age and cracked, funnel body cast and old, tails were VIR. ZE of 151ohms
Called them, they came out within the hour, slaged me to the ground to the customer called me lazy and a rougue and told them that i was wasting their time and the customers time and that i should have TT the installation instead of calling them (which i did).
Not impressed if im honnest