All cops are different, perhaps he'd had a hard day or you were a little too polite & he took it to be sarcasm, if there's a next time, don't smile, keep dead pan when you hand over your documents & of course, keep your seat belt on, I remember one day when I'd had my licence about a week, one pulled me over & asked to see my licence, I was nervous, so much that I hadn't turned off the engine, & when I reached across, my foot slipped off the clutch, & I did the classic KH, [kangaroo hop] & banged his arm as he reached out, he gave me a dirty look, handed it back & said on your way, but of course this is England, & they're a bit different over here! or they were then in 1973, nowadays they're targetting young drivers.