You’ve lost the plot.It will be interesting if they do do any damage to any of my property as they only have the right to enter property for safety reasons or if i have not paid my bill. As we pay by DD and I submit reading via t'internet, they can only legally do a safety inspection without my permission.
Any damage to property would cost them dearly.
The meter and cupboard belong to them, your padlock is simple a device stoping them from reading their meter. If they need to cut if off to read their meter, you’ll find in the small print of your energy contract, their right to use whatever to read the meter. Have you never read of customers doors being broken into on account of the supplier being a dickwad, and fooking up communication with the homeowner?