There is an interesting FoI response up on WhatDoTheyKnow? The request was to see what documents there were relating to plans to put RFID tags in bank notes. The response is that there is too much to give within the prescribed cost limits for a request, from which we can presumably conclude that plans are at a relatively advanced stage.

The civil liberties implications of this will very much depend on the range of the particular tags used. Could we have government detector vans driving round the streets looking for stashes of cash? Will the police know how much cash I have in my pocket?

We need to know.