I got done a while back
Single yellow line, but ticketed for causing an obstruction because I was parked with two wheels on the pavement. Pavement which ends in a muddy grass bank six feet further on, so who I was obstructing I don't know. Anyway...
Fast forward a few months and I see another car parked there. All four wheels on the road. Ticket on the windscreen. Nipped into the office and printed out some details regarding legal requirements for yellow lines (the fact that they should be T-barred at the end, for example, whereas this one had a big gob of paint and that's it). Left it under the windscreen wiper, next to the ticket.

I like to think that I had a small victory in getting someone else off a parking ticket, presumably it was successful as they repainted the line a few months later.
( eXOBeX, Thu 17 Feb 2011, 0:05, 1 reply)

After
I got the 'no further action' letter, I pinned everything up in order of correspondence on the message board in the RBL on the same road (this was before it became apparent that they actually owned the road) so that others could use the same tactics - living there, I saw the scummers put tickets on their cars nearly every bloody week!
They actually knocked back the t-bar/non visible/broken lines argument - which I expected on the first appeal to be honest; it was the Notice to Owner and the 28 day thing that I think got them!
(dchurch bah, Thu 17 Feb 2011, 7:54, closed)