[scowa18]

Would something like this work? They can be found at most auto parts stores in the US for $5 or less. I would assume they have them on your side of the pond also. You could probably even make your own version with things you have laying around. Like glue a magnet to a dowel?
http://www.amazon.com/Repair-Flexible-Slender-Metal-Magnet/dp/B007Q9VGI8