The question of congestion charging is not just a UK issue. In fact although not many of us realised it, Brussels proposes a directive to have community wide road charging by means of the European Â£2.3billion Galileo satellite. Harmonised road charging is possible EC wide on the satellite, a European alternative to American GPS.
So it is a question of how much the on board car unit's are going to cost and when the EU directive will come into force.
Just in case anyone thought this was a local issue....
The Satellite has been up there for some time, the system exists to incorporate the existing road charge schemes in Germany and UK including London congestion charge and the technology will also be able to track vehicle parking overnight whether on your land or a roadway/car park.