When I went to Silverstone with my old man some years ago (I was probably about 14) a Ferrari truck stopped as I was walking out. The cab had 2 men in, and 1 of them wound the window down and passed out a tiny Bridgestone flip-book type thing. It had circuit information for each race, and a map of each layout. Was pretty cool, I still have it somewhere I think.
Although not F1 related, I also saw a McLaren MP4-12C on the A3(M) towards Portsmouth back in April, probably driving down to the McLaren shop that they have near Port Solent/Cosham (I live in that area)