Thank you very much, this is really useful advice!
Christmas itself is hopefully not going to be too bad for me, as we are having family here, so I can control what I'm eating / how I'm cooking it.
However, we are away for New Year and I'm not looking forward to that so much, especially well meaning people trying to get me to eat fattening things! Hoping I can at least stay the same weight over Christmas and allow a couple of flexi days at NY.