Defo a parking fine scam. I let the call ring to voicemail as I didn't know the number and the message left was a clever automated one that perhaps changes if someone picks up. The message started halfway into a sentence, saying "'...from 2012 so erm the total charge for the ticket including interest is £220, how would you like to pay'. Then a silent gap, I assume timed for someone who answered to say something in response. Then him saying "erm, if you don't pay by tomorrow it will double to £440, would you like that to happen?" Then another gap, then "Hello are you there?" Then another gap, then "This is what happens when you can't park properly, have you since learnt how to park your car, huh?" Then another gap, then "Have a nice day and drive safely". Call ends.

I called back number 020 3936 4636 rang once then gets disconnected automatically.