30KW per day for just over 3 months in an empty 2 bedroom apartment. Usage with tenants prior to this 10KW a day. Now usage is 4KW per day. Basically I had a bill of £650 for 3 months.
You're saying it was appliances... indicating you know what was the cause... but do you? You have a large bill, sure... but is it explained? It's good that you're not just talking in £s, but in consumption... indicating something was up-and-running... but what? If the property was truly empty it seems like something is
fishy, not just inadvertently left on.