just noticed my failure, oh boy. Luckily I am not from Nottingham so i have not picked up there horrible use of the language.
The moisture resistant boards often used in bathroom and toilet areas are really dense, you'd struggle to kick through one (unless your wearing steel toe cap boots) and you wouldn't punch through it without making an absolute mess of your hand... and if was double skin you'd have no chance without a hammer of some kind. *i'm a dryliner*