I agree with John, my mate got pulled while I was with him, they were saying he wasnt insured and hadnt declared any mods, he picked up his mobile and phoned his mum(he didnt really, but i didnt know this till later on) but he was having a good convo over the phone and the copper just said, ''right lads, that will do, off you go, and dont forget your seatbelts''.
They just try to scare you, FPMSL when my mate showed me his call register and that he had phoned t-mobile to check his balance and not his mum about his insurance details LOL.