Number plate tax for the UK?

I've just been reading Senate Bill 451-FN thats been passed in the State of New Hampshire and will take effect from July 1 2010.

A little unnerving as it's all about placing an annual tax on vanity number plates.

You've got to wonder how long it'll be before the British Governent get wise to this little earner?

http://www.gencourt.state.nh.us/legislation/2010/SB0451.html

Reg