One of the easiest ways is to get a nominee account. LloydsTSB have a service called ShareViewDealing which I have used, it was fairly straight forward. You're not going to get the best prices with a nominee account but the transaction costs are low. As I understand it you not truly selling to the stockmarket but to and from your nominee account operator, who are in the market. They offer you prices close to those of the market and they make money on the fluctuations between that price and the ones they offer. As long as you're not day trading I can't see that you'll notice the price difference.