You need section 144A as inserted by the Water Industry Act 1999.

http://www.opsi.gov.uk/acts/acts1999/19990009.htm#6

Yes, that was my understanding before, that the water supplier is entitled
to install a meter whenever the tenant changes.

Basically, if the OP moved back in, the water company could insist on a
meter right now, even if none already existed.

Christian.