Somehow just poped into my head and wondered what the outcome was. .i shall explain!

a couple of years (2/3?) a competition was held from such company as walkers (i dont know if this is the correct company but simmilar, was defo a food or drink company) buried 3 or 4 cars (Mg 2 seater thingy's) in various secret locations around Scotland, possibly England and either gave clues to customers or just let them cluelessly wonder around digging in the hope to find the cars that they could keep!

Sounds weird, but interesting, does anyone remember it or am i going mad