Another post reminded me but just in case anyone has eyed these up in the garden centre and then thought may not be any good and it's too expensive.
http://www.burgonandball.com/dbpages/mbpb/master.php
I got one and i have to say it is brilliant. I have a huge patio of small pavers and lots of weeds growing between but in a very short space of time....less than an hour instead of days with a weed knife.... i was weed free.
No i don't work for the company!
There are cheaper versions about, we picked one up at Stapeley Water Gardens ( not somewhere I can reccommend traveling a distance to for water plants) for under a tenner.
Whatever you pay for them, they are worth it for the diference they make and the great cardio workout you get. One of those jobs full of satisfaction. :)
Mine was cheaper than that...it was on special.