Sorry, Ossifer!

Got home from Ken's this afternoon to find a car parked across my driveway (even though there are double yellow lines in front of it). I had to turn right across the traffic to get on to the drive from the direction I was coming from so sat in the middle of the road with my indicator on and honked my horn a couple of times to get the attention of the young guy that had got out of it. He glanced at me and then just folded his arms and looked away. So I wound my window down, blatted away at the horn again and shouted "Excuse me, is that your car?"
By now there was a fair tailback of traffic behind me and he started to head towards me looking shifty. As he approached I repeated "Is that your car?" to which he nodded.
"Well, could you move it please, you're blocking access to my driveway".
At this point he leaned into my window and opened his wallet to show me his badge. West Midlands Police. "I'm sorry," he said, "but I can't move it at the moment as I'm trying to keep an eye on something". Following his nod I finally notice the dodgy chracters making dodgy deals outside the pub opposite, now walking nonchalantly away.
Oops, sorry Mr Plain-clothes-copper-man. Maybe next time you'll park legally and a tired driver won't blow your cover.