The meal that most people who struggle, struggle most with, is breakfast, but it's also probably the most important one to 'fix'.
My wife's doing Slimming World rather than iDave, but that essentially rules out having a cereal/milk breakfast so what she's been having is iDave-compliant.
Usually, it's smoked salmon with tomatoes, chopped spring onions and a boiled/fried egg followed by some fruit. Quick, easy, tasty and fairly flexible.
On days when I have a similar breakfast (usually baked beans and ham and egg), I notice that I'm far less inclined to snack during the day.
As bread's pretty much out on SW too, she's been thinking a bit more about lunches too and so isn't just grabbing a sandwich.
Our evening meals have barely changed from before and we still eat pasta, etc.
Even with beer and chocolate, I've dropped from 11.5 stone to just under 11. She's dropped about 2 stone since the start of July.
Like iDave says, eat what you like, but accept the consequences. It seems that people who stop iDieting fall right back into pies and chips and beer and crisps and chocolate; so why not just make small changes instead?
Start with breakfast, then change the snacks and so on.