Dear Jean, "Just no imagination, Mikey :-)))))" Absolutely, that's exactly what I thought!!!!!!!: -)) The teachers must have been Eskimo's; "Taking coals to Newcastle."!:-)) Nottingham is built upon sandstone and clay, the whole of the City is riddled with caves? The Shire is full of brickworks, claypits, sand and gravel pits. Half of the bars in one of my old local pubs, " The Trip To Jerusalem." a Crusader Inn, are carved out of sandstone!! Children only have to poke a stick in any garden and guess what they find!: Yes, worms!:-))))))) " A well thought out educational experience"? mmmmmmm, yes just like the 90% that followed:-)) Regards, Mikey. Spectemur Agendo.