Granted - the car does need to be registered, however TFL are saying the vehicle is euro standard 4 and are saying ithe golf bluemotion is not exempt from congestion charging at all.
VW according to their website are saying the car is exempt subject to it being registered. but if the application is rejected all together due to the vehicle not being able to meet the euro standards then VW is decieving people and Im pretty certain this would be a good story for the car mags