Barry2a

Hi, I'm after some advice, so I'm just doing a few tests with the materials list out of HDP 21. So I'm in the UK and ive defined a UK wall with UK blocks 440 x 215 but for some reason the materials list function just will not calculate the amount of blocks in the wall correctly. Am I missing something or is this just an issue with the software? Any help or advice on this would be gratefully appreciated. Gareth