All circuits must have:
1. A means of isolation and
2. A way of limiting the current so that the amount of electricity does not exceed the capacity of the cable.
In your landlords property there will something that provides the functions of 1 & 2 above.
This might be a circuit breaker in the landlord’s electrical panel, or a separate fuse and switch. This is essential to limit the load on the relatively small cable that runs to your lodging. It stops the cable catching fire if you decide to connect a kiln to the supply.
This is standard wiring regulations.
If you are having disputes over the amount of electricity used, the landlord could fit a private meter on the supply to your lodging. He can then charge you on the basis of actual amount of kWh used.
Second hand ones are cheap.
This sort of thing
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Be careful, it would be simple for him to fit a pre-payment meter and have you put £1 coins in to pre-pay for electric.
But look at your rental agreement, is it all inclusive of energy? He’d need to provide a new agreement if the terms change.
Or(as above) he could give you notice, or you could move elsewhere …