This is most likley the shop i will be going to. They have some nice tanks, heaters etc and they have some water tester kits in there.
Their website is a bit of a mess but they seem to know what they are talking about.
http/www.grosvenor-tropicals.co.uk/Produ.../Products.shtml
EDIT: Ive heard that getting 'Mature tank media' Can help speed up the cycling process in my tank. I have a friend who also has a fish tank, but what do i ask them for? Some of their gravel?
I took a look at that website, looks like a nice place to shop, you should have no problems finding what you need.
Gravel will work, it doesn't have a huge amound of bacteria (most is found in the filter), but enough to help. Add some to a clean (as in new) nylon, and place it in your filter. Or depending on the type of filter your friend has, he/she can cut some of their filter floss/sponge or give you some of their bio-media (ceramic rings, bio-balls, etc), and again you add them to your filter. Just make sure you keep the borrowed media/gravel wet until you add it to your tank, and obviously don't add it until your tank is set up and running.