Looks like it's "just" an AdBlu addition to the exhaust system, with a "special" section to do the magic.
This is a snippet from the Energy Savings Trust web page, linked by Skipjack
"Due to the cost of a retrofit exhaust after-treatment system and the complexity to fit within passenger vehicles, retrofit will most likely be an uneconomically viable option for most vehicle owners. Purchasing a second hand Euro 4 petrol car could be the most economical solution to comply with an Ultra Low Emission Zone (ULEZ), Clean Air Zone (CAZ) or Low Emission Zone (LEZ).
There is one CVRAS approved solution for the Euro 5 Land Rover Defender model years 2012-2015. The CVRAS is open to receive applications from retrofit system suppliers as the test protocol and standards are set (the same as for vans), however drivers should be aware that only CVRAS-approved systems will be recognised by local authorities implementing an ULEZ, CAZ or LEZ."
Cheers
Dave
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