Thanks a bundle Ratboy!
Sage words there and much appreciated. Chances are we'll have three seats on the bulkhead, which will be great for room to play. The plan as it stands is to have a separate bag/sack full of favourite toys and blankets, as well as a good supply of drinks/milk etc. I've no idea what a BBML consists of, probably jars and stuff, but we'll plan to self-cater.
Fortunately she's a happy soul and doesn't get the hump over much at all, except at bed time when she's sleepy. With a 2315 departure though it'll be well after bed time so with any luck it'll be lights out very quickly.
Thanks again for your trouble
Sq