One of the best things I ever did in terms of my research was to subscribe to GenesReunited. This is a site where you can load your tree and the computer works its magic to connect you with others researching the same ancestors. I found living second cousins through Genes and was able to open up entire new branches of my tree. You will get some matches that are obscure but the wealth of connection and information you get far outweighs the obscure matches.
Here's the link: http://www.genesreunited.co.uk
A 12 month subscription (for the standard service, which is all you really need to get connected) is about £25 a year. Well worth the investment.