It is expensive I agree. Unfortunately, LL is a property management company; but the company handling the energy is a completely separate company that manages the apartment block. They decided to use e-on, which I'm aware are pretty expensive as-is. They've assured me they don't charge anything above the electricity tariff but am waiting for evidence of this. LL didn't inform me of the fact that we were on sub-meters before moving in (and therefore unable to choose our own tariff), so I'm trying to get a rent reduction to cover this.
13kWh I don't think would be entirely unreasonable if we were using the central heating, or if we had access to hot water whenever we wanted it.
Even using standard UK average; 13kWh x 0.145 = £56.55, for a household of 2 people, with limited hot water, no central heating, and being extremely vigilant with turning off lights+switches+appliances - isn't that a lot?
Yes - access to both; after extensive argument with the block manager they eventually gave us the code for the door to access our sub-meter, so I've been checking it daily to monitor our usage.