It doesn't sound like he is even covered by the price cap:
https://www.citizensadvice.org.uk/ab...-energy-bills/
Quote:
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Some tenants are charged via “sub-meters” where landlords organise energy for the building, often through a business energy supply contract. As the price cap does not apply to these contracts, tenants can see rapid price increases and miss out on support. People with prepay “sub-meters” are especially at risk, as they could be left without energy if they cannot afford to top up
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