Not sure which this is, leaning towards timeswitch but whose is it? It's fed off its own meter and switches a contactor in the enclosure to the left, which in turn feeds a CU that once housed storage heater MCBs.

I'm fairly sure it's the suppliers responsibility.

At the moment the contactor is making a loud buzzing noise and is warm, not hot, to touch.

Phones supplier and i may as well been speaking swahili, they tell me to call the DNO, they say it aint ours phone supplier.

Lets go round again.......