Sorry for disappearing, was off dealing with my 'awful' children.
The problem actually was that at the start of the holiday, they made several comments about how it's holidays, that standards can be relaxed, more treats etc when we said no to the ongoing flow of sweets, biscuits and fizzy pop (we were happy for our kids to have organina but there's no way they're going to get Coke - they're only 4 and almost 3).
And although I had relaxed things - our kids were going to bed an hour to an hour and a half later than normal - I thought, fine, let's go with it and give them more treats and follow the other couple's lead.
But I also know that with excessive sugar/junk, my kids' behaviour gets worse. And they also quickly come to nag for everything because they think that's the order of the day. So the minute I went with their more relaxed flow, my kids started to play up slightly more and then the other couple kept making comments about their lack of discipline and how I must have such patience to put up with it.
I felt completely confused as to what they were expecting - relaxed free for all or being tougher on them.
At one point the husband yelled incredibly angrily at my son who was having a tantrum because he wasn't allowed an ice cream. Why was he having a tantrum? Because the day before everyone had been allowed ice creams but on this day the other couple decided that the kids were having too many treats so said no. Their kids didn't put up a fuss. Mine did. I've never been so embarrassed (and angry) in my life.
I think lesson learnt - don't holiday with friends. Or at least make sure you stay in different houses that are in the same complex so that you each have your own house rules and space.