<font face="Verdana, Arial, Helvetica, sans-serif" size="2">book months in advance if you want to utilise the super discount fares. </font>
Not necessarily. Both Easyjet and Ryanair run frequent seat sales, and you can often get very good deals at fairly short notice. It's a bit of a lottery, really... book too early and you may be missing out on a seat sale nearer the time of departure; wait for a seat sale and you may find they're not going to have one for the dates on which you want to travel.