Hi Alison,
For the May date we only have a Heathrow departure, but you should be able to make a connecting flight there.
We are currently reviewing the carrier for this tour for 2015 as our current provider is not able to meet our requested allocation. I understand that a decision should be made towards the end of next week - if you give me a nudge I should be able to give you the provisional airline and flight times.
Kindest regards,
Julia