OK crappy joke, a python is a type of hose attached to a sink that you can use for both syphoning your tank and then refilling, all in one
Andrew
Oops I do believe they are availible in england, but I dont know where - or you can make them yourself, ask in the DIY section you will get plenty of help
A python is basically a pipe that will help you siphon out the water from your tank, using the pressure from your tap.
I don't know if you can get it in the UK, other members may know better, but you can also make one on your own. The DIY section shows the working of a python and making it on your own