We'll be happy to say hello if there's a DISmeet.
We're flying on October 18th, staying at AoA Little Mermaid for 3 nights, then POR for 21 nights, flying back on Veteran's Day.
Not sure if it will help you, as flying out from Paris seems much cheaper than flying from the UK
we'll be on US Airways, CDG-CLT-MCO, return MCO-PHL-CDG.
Return fare on S class (super discounted economy) was 535 euros ( £430 )
We booked on February 11th through Expedia.fr
I made lots of simulations from Heathrow, Gatwick, Brussels and Franckfurt, and couldn't beat that price. Same airline (US Airways) was consistently £100 more expensive from the UK than from France. Based on this, I'd say that £530 from LHR looks like a good price.