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Yeah it's the common term for it but it's not a different test or certificate, just has a note saying there were no lights fitted and it's not related to indicators. Having said that not many testers actually know what the score is and plod aren't much better. I used to keep the MOT certificate, a highlighted copy of the MOT testbook and relevant construction and use regulations under the seat of my bike after having a couple of roadside discussions that didn't work out in my favour.
It's what my MOT guys used to call it when I rocked up on the battered TZR. I don't think it's pre-84 but they used to mutter some incantation and give me the paper. I suppose I could check the old MOT's to see what's written on them. Thanks for the detailed explanation though.