Thanks all. Yes, it's a long way out. It will be a reward booking and will be a special holiday without the children- so needs a lot of planning and warming up of the grand-parents!
I mis-remembered the wiki post at the top... so given the reduction in fleet, guessing maybe one service will stay as 744 and the second to another type.
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Yellowbelly - thanks for the heads up on T3. That makes the decision a lot easier. I think we'll stick to LGW and go F out, CW back- assuming the availability is there.