Most Jewsons have a deal with local water authorities, You hire a stand pipe from them that has a Meter fitted, I think when you return it they then charge you for water used on behalf of that local water authority.
Don't quote me on that but here in Southwest area thats what happens.
Look up your local water authority online they all usually have info regarding standpipes on their websites.
Again don't quote me but I did read somewhere there is a £5000 fine for improper use, so be careful.
Goochie.