Have alook at www.cheapflights.co.uk as most airlines advertise here and you can compare prices with Ryanair, bmibay, BA, flybe, Airfrance, Thomson, Monarch and many more.
I haven't searched through, but I expect you could sign up somewhere.
I work in travel and I have found you get a good flight deal either 6+ months in advance. Or, if you can be flexible on dates - late deals are possible, as long as you don't want to go when everyone else wants to.
Always make sure you are ATOL protected when you book a holiday and ask for ATOL details. Don't be afraid to ask, as a holiday company that is ATOL protected won't mind you asking. ABTA (travel agents assoc) is not the same as ATOL.
I do not work for any companies that I may post about.