In reply to Rob15:
are you looking at spending a bit here bit there and looking to get a piece at a time, or do you have say £200 to throw at it in one go?
If the first keep an eye out on here for 2nd hand and trawl the web for offers and get what comes up as and when - set of nuts, 5 draws, 2-3 screwgates, few varied slings being helpful particularly as partners will usually be able to help out bringing you up to a full rack.
If it's a lump there's an article on here if you look (easy to find) that's useful, then work out few details and get down to your local shop and discuss a deal for big purchase