eHarmony

eHarmony United Kingdom first began in 2000 and is now one of the top online relationship services providers.

They have a bespoke Compatibility Matching System that allows members identify compatible persons with whom they are likely to be able to enjoy a long-term relationship.

They appear very geared towards people looking for long-term relationships. Their marketing materials mention this a lot (apparently in the United States an average of 236 eHarmony members marry every day!) and they have an in-depth, confidential psychological questionnaire that helps them find you compatable matches, so if you're ideally looking for a long-term partner then this might very well be the best website for you.

I note they also appear to be very geared up for people who are a little shy, or unsure on the subject of how to talk or behave on the dating scene, as they have guides and options that help you communicate in the early stages of a relationship.