We were talking about this at the last nano, and preface lift CDT are 1.00 and may struggle if not in tip top condition as well as the CDTI as you say 1.33 therefore it is best to make sure before your test, change the PCV filter, Air filter, maybe the oil, & it's oil filter, maybe now combining your yearly service around your MOT time.
Drop in some diesel cleaner at the same time, then give it an Italian tune up 30 minutes before you get to the MOT station I have always done this anyway.
It will be good to follow this thread to see how the OP gets on over the next few weeks and months.
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