Daydream Believer
Striker
Its unusual and a good job its not a key meter, shit loads of rental properties have key meters for the exact reason that loads of tenants were doing flits without paying the bill. If it was a key meter they would have to be in your porch every time they put any credit on the key or card. That meters technically on your property, if it was me i would insist it gets shifted. Its not a 5 minute job, probably expensive and would have to be sorted by the current supplier but none of thats your problem mate.
I've refused access to people turning up to change the meter to a key one in the past & told them not to come back without a court order or an agreement to shift it & never heard anything back.