On Sat, 07 May 2011 00:45:35 +0100, Frank Erskine
wrote:

ISTR silver sand as the "posh" stuff used by gardeners in the 50s, but
I've never seen it advertised anywhere on the Interweb..

It's in the Wickes catalogue, which is how I learnt that such a thing
exists, but I've never seen any on the shelf at my local store.