I've got a small problem with a would-be purchaser of my property. The garden is on a slope and the height of the decking is less than 30cms. at one end but because of the slope it is higher at the other end. There are no other issues as the shrubs to one side of it are higher than the top of the posts (for the retractable blind) - therefore no privacy issues with the neighbours (who haven't complained). The purchaser and his solicitor are arguing that it needs planning permission as it is higher than 30 cms. which it is in certain places but this is because of the sloping garden. Any ideas would be appreciated. I don't really care as I've threatened to remove it and burn it if he isn't happy but it would be nice to know.