Done that when pulled over, whilst at the lights(one of many) in Shipley. Officer wanted to know where the licence plate was, there wasn't one on the rear. So it was a case of going over it with a "fine tooth comb" time.
Licence: NO
Road Tax: NO
Insurance: NO
Indicators: NO
What size engine: You're looking at it. What do you mean?
Then having to point out that the thing, A Brox, was pedal powered, with me alone providing the power. Not impressed, he radioed in to check on the legality. And was met with the question of the make, model & colour. Colour he could see, make & model were unknown to either him or the person on the other end. Asked if they had access to the internet to check things, met with a cautious yes when relayed to the other person. Told them where they could be bought, Bikefix & that they could view it on the shop site. Tense wait whilst this information was checked & then mine checked against what was shown on the site. Pedal posistion, dual chain use, the fact that there was articulation in the vehicle. No engine of any sort fitted.
Not pleased when he was informed that what he'd actually stopped was a pedal cycle. And therefore didn't require a driving licence, road tax or insurance to be on the road.
I'd an uphill start from where he pulled me over, when I set off.