Thanks one and all for the tremendously kind and helpful advice.
Had the op done and am sat at hope with a slightly achey wrist but otherwise fine. No cast, no splint, just a few bandages. I have to go to the GP to get the wound checked and re-dressed on Thursday then the bandages should be mainly off and I can wear a little velcro wrist support.
All of which means, touchwood, we should be fine to jet off for some sunshine! Just need to get the OK from the GP in view of having had general anaesthetic a week before flying.
Thanks again to all who contributed.