It's infuriating when you lose something important like that. I couldn't find my insurance certificate last time I taxed my car. I turned the house upside down and still couldn't find it, then, fortunately, discovered it still in the envelope they'd sent it in.

If you tell them that you can't find the previous MOT certificate, they might do it without, specially if they're the same people who did the previous one.

As a matter of interest, how will freaking right out manifest itself?