Unregistered

I need to do some work on the supply pipe from the road into the property, can anyone advise me as to how I cut the supply from the meter in the street? The meter has a plastic type handle sticking up but this seems very fragile & feels like it would snap if I turn it?

Am I being thick or missing something as I cant see a simple isolation valve........ I would rather just carry this out simple task myself without phoning the water authority but I get the feeling a special tool is needed?

I am in Dorset, Wessex water.

I would greatly appreciate some help if anyone has the answer.

Thanks

Mike