Locally, and parked up together, there's 5TOP on a pov-spec 306 and 91X on a fairly unassuming Volvo V40.
Years ago I saw TOX1C on a 300ZX down near Slough.
Saw this plate a few years ago:
Like Seth's A60 shot, it's really on the wrong car and ought to be on a Datsun 180B (late 70s models have that as their model code).
Which isn't very remarkable on its own, but parked next to it was a Passat with 1OSF as its plate - I had to check DVLA to work out what they'd done, initially I thought the Passat's plate had come off the Type 3.
Mum and stepdad have had D80DLE for years, with a strategically placed screw through the 8. Came to them on their XR4x4 (believed ex-Rumbelows, for shite value) and after a friend then had the car for a few years they bought it back for the plate and have stuck it on their cars ever since. They did get ticked off by over-zealous police when on holiday last year, but compared to some of the tweaked letters and numbers I see that seemed a litle harsh.