Re: ROAD SIGNS
"There was a Top Gear episode where they interviewed the woman who did the design of the signs."
Margaret Calvert. If you have access to BBC iPlayer it is currently available as Series 14, episode 7. She also recently featured in Secrets of the Museum, the programme about the V&A, but that's not currently available.
Or see:
http://britishroadsignproject.co.uk/jock-kinneir-margaret-calvert/
Incidentally, the brown background for tourist attractions (introduced in the 1980s) has more recently been adopted in other European countries.