jeffb
Re escape and evasion bits. Imperial War Museum shop sells cuff-links with a compass in them. Doubt whether they are the type used in WW2, as they are too obvious, but interesting nevertheless . See here:
Compass cufflinks : Welcome to the Imperial War Museum Online Shop
Meanwhile over on eBay there are a quantity of scarves etc on sale including a "Escape Map Silk Scarf WW2 World War 2 Official IWM military memorabilia". See here:
http://www.ebay.co.uk/bhp/silk-map