When it comes to frustrating gardening tasks, clearing weeds from your driveway has got to rank among the most annoying. Editor Steffan Rhys shared his annoyance, saying: "The weeds on my driveway have been a nightmare for years. I have a block paving driveway - and most of the time every single brick is surrounded by a hideous combination of weeds, grass and moss. "When the driveway is free of weeds (which is almost never) it looks bright and lovely. But when the weeds have taken over, it