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EagleEyez
Automatic MOT Fail if detected.
My old van was pre AdBlue. Was a VW T5.1 with DPF. The previous owner had the DPF removed and remap. I had to bribe my MOT tester to pass it every year. The amount of black smoke it kicked out sometimes was horrific. I thought not having to worry about DPF hassle was great to begin with, that wore off pretty quick when overtaken by hassle of getting MOT's, and also general guilt of emissions.
The van was written off in a collision a year ago, and was replaced with a newer T6 Euro6 van with AdBlue Sytem. I would in no way consider attempting to alter the emissions systems at all after previous experience.
Also, as far as I'm aware just stopping the AdBlue system does not mean you wont get DPF issues down the line, as you will still have a DPF. AdBlue just assists with the burning off of carbon at high temps inside the DPF, it doesn't replace the physical DPF unit in the exhaust system. If anything i would assume having just the AdBlue function deleted would just end up making DPF issues down the line more likely as your DPF unit will be designed to work in conjunction with AdBlue*
*I am not a mechanic