Should I have the emissions update done?

I have a 2014 Skoda Roomster 1.2 GTI. It has been serviced as manual and passed first MoT earlier this year. I have been sent notification of having emissions update carried out but am concerned by conflicting reports about the necessity of this and of the performance following the procedure. Advice and comments welcomed.

Asked on 31 August 2017 by Len Driver

Answered by Honest John
Basically they now guarantee to fix any issues your car may have after the NOx emissions fix, or, if the injectors and EGR of the car are obviously not in a fit state to accept the fix, they don't do it.
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