flake is right in what he says but if your determined you could try fotolia
http://en.fotolia.com/ which i think are uk based or at least have a uk branch so to speak
it's a question of numbers the more you submit and get accepted the more chance of somebody purchasing one of your photo's but don't expect to get rich any time soon the pay rate is pittance from 33p to a couple of quid depending on the size of photo they want
a better idea if you think your photo's are good enough to sell is to make a website up or use one of the ready made web sites and put a portfolio together and see if there is enough interest to basicly make money but you have to remember it's you and half the population with a DSLR with same idea