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Do all diesel cars require AdBlue topping up?

Regarding your comment in the Audi A4 review that "all diesel A4s have a 12-litre AdBlue tank that will require topping up between services; the car warns you 1,600km before it runs dry". I presume a similar feature will apply to other marques. How much roughly do you think it will cost to get it topped up, and what would happen if it's not topped up? Will the engine refuse to run or will it damage the engine (as well as the environment)?

Thanks

Can I alter the exhaust in my Land Rover Defender?

I have read that by removing the catalytic converter and the EGR valve from a TD5 Land Rover Defender, the car will perform better and be a lot more economical. There are replacement pipes and plugs available on the internet, for that purpose and it is MOT-approved. My question is: if I do this in Ireland, would my Defender fail the NCT test?