There's one near us that reads TO55 POT

A well-known one in our town (Bude) is H18UDE (tweaked to look like HI BUDE). I've also seen a couple in Morrisons car park: SO81 ZZY (tweaked to SO BIZZY) and SEE 21T (tweaked to SEE 2 IT).

If any of these is yours, you're a cock!