Thanks for your helpful points Richard and Marcus.
Richard, my feeling was for a thicker high quality ply panel but will also pursue ABS (I have not used it personally)
My canvas maker just suggested MDF but I'm never keen on it personally, he also reminded me how important it will be to have the painting carried in hand luggage - he having just seen a canvas of his warped horrendously in the hold on its way to Portugal recently...
The humidity can range from 20% to over 85% (which - gasp - it is currently!)
Marcus, I shall do my best to get it thoroughly dry, actually thats a bit of a worry though as that may be very hard indeed - the family are coming back to the UK at Christmas to collect it!! :-/
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