Thanks @MaryAnn,@P-JK, @Lizbean, @WMR309, @SSure - more useful suggestions!

I will aim to not have lunch if I have a big brekkie when on holidays - maybe just an apple or two to tide me over til dinner. And I will keep up the water intake too - I hope that might be provided on the bus tour??
Liz, a retreat for mainteneers - sounds like a great idea! Could we manage a virtual one I wonder - finding a suitable time of day would be a challenge tho!

On a related note, I have finally read most of Amanda Sainsbury-Salis' "Don't go hungry diet" and a lot of what she says re the science of weight management does make good sense to me. I believe that @Sallyo was trying the "success diary" where you record how hungry you feel before you eat, what you eat, and how satisfied after you eat - until you really understand your body's signals. Any comments Sally? I feel that this approach would be worth me giving it a go, to try to help manage the evening munchies...
I know carorees and others have commented on/ referred to Amanda's work, particularly around the Famine Reaction. I found the Fat Brake material also very interesting, and think this may explain why many maintaineers can "re"lose weight gained over a short term, quite quickly.
The one area she does differ quite a bit with many following IF is on the importance of breakfast. I know that on this forum many mainteneers and others following 5:2 don't have breakfast (I also know that quite a few do have breakfast), and I wonder if for some people, having breakfast may help with weight loss, for the reasons she states. If this is the case, I also wonder if maybe - on this forum - there is too much emphasis on how much not having breakfast has helped, which can encourage other people not to have breakfast - when in fact they may be better with it??? I stopped having breakfast as a result of reading this forum, but started having breakfast again sometime last year when I was probably suffering a famine reaction, and now generally do have breakfast of eggs and rolled oats (separately!!), and I have started adding other foods if I still feel hungry. (But it has not yet help me stop wanting to eat at the other end of the day!!!)
Anyhow, so much to think about!