I got pulled with no MOT or Tax a while back, got given a producer.
Got it MOT'd the following (and it went straight through ) then i went down to the police station at 1.30am (hoping to catch them tired and not to realise it was mot'd after the producer)

Well the old bitch did and said she'd have to state that i was unable to produce the test certificate.

Then I get a summons to court. I went, said i lost it, so i got it MOT'd the day after it was brought to my attention.
Got off with having to repay 3 months back payment on roadtax