I've got some tourmaline and malachite. The best places, you'll find, and here I start to sound really geeky, will be on mine tips, rather than in situ. You'll know that hydrothermal veins caused by rising igneous intrusions radiate out and the minerals you find at certain distances will be determined by temperatures at which they solidify (low melting point means long way out) so the bits they mine are full of bits they don't want, you can find some really nice stuff because they just throw the gangue on to tips. Look for tourmaline in granite, you'll find some if you look hard enough and you could find malachite at pretty much anywhere in north wales or anglessey and there are old copper mines on bodmin moor ( I found some decent malachite just north of Liskeard at christmas)