SSE forceable changed meter in rental and now its flooded

[PinkFatBunny]

Strange one, I get a call to say that new tenants don't have any gas or electricity. Upon further inspection turns out between the time they looked round and moved in SSE had gained access to the property and switched out the meters to 'pay as you go' due to previous tenent not paying.
In doing so they turned off the power to the sump pumps in the cellar and as a result I have 4 feet of ground water in there which has damaged the boiler and left loads of mess everywhere.

Aside from a tenent with no hot water or heating which I'm having to give them free rent, do I have any rights against SSE for the damaged caused?

[PinkFatBunny]

They came back after the tenent had left, property was empty for about 4 weeks.

Not sure how they got into the property, ie no damage, current assumption is the letting agency left the door unlocked!