I wish I could plan so far ahead!
Living in Plymouh, we don't have a good airport near us - usually our options are restricted to Gatwick - although there do seem to be some changes afoot for this year,especially if we go flight only.
We've found in the past that May holidays are reasonable, and we couldn't improve on the price by booking flights, rooms and transfers for ourselves. The September prices are such that we are thinking about a go it alone booking this year - I'll let you know - and will probably for asking for advice on the board if that's what we decide to do.