Quote: "The figures and yields will get a nice boost in May from the Heineken Cup Final. It should probably guarantee 4 full Belfast flights each way. Although, realistically, Southend is about as handy for Twickenham as Southampton is"
It's much easier to get to Twickenham from SOU than SEN: there's a railway station on the the airport with a frequent service, with just one change at Clapham Junction, (there's no need to faff around on the underground). By road it's straight up the M3.
However, SEN is easier than LTN and STN.
LHR is on the doorstep, so easiest of all.