@BrassicaBabe - good plan.
Skipping the KFC - excellent. What will you have instead? Some smoked salmon or egg and prawn mayonnaise with a few salad leaves? Cheese and ham rollitos? M&S do some good portable options.
Eating just the cream and not the scone sounds wonderful. Remember to take a wee plastic spoon with you wherever you go so you can scoop up the cream and don't have to use scone to transfer it to your mouth, and beware of accidentally eating some jam mixed in with the cream.
What will you have with your wine instead of crisps? I often take a wee bag of nuts ( almonds hazelnuts, or macadamias), especially if we're going out to the pub for a drink. You don't HAVE to eat them, but they're there if you feel tempted. And a square of 90% cocoa chocolate in the evening.... Or you could make nutbutter cocoa bombs - a high quality nut butter, mixed with raw cocoa powder, formed into balls and rolled in desiccated coconut. You need to keep them in the fridge. Things to prevent you from feeling that you're depriving yourself or missing out. And things that are high fat.
I understand the bread / chips decision on a good meal out. Can you limit the quantities? e.g. bargain with yourself that you will have either bread or chips, and not both? Or half the portion. So if you had a fresh crab sandwich, could you take off the top layer of bread, leaving an open sandwich? Or get chips to share with someone else rather than a portion to yourself?
And remember to drink lots of water. Always.
But most of all enjoy yourself. This is a way of life, and it's got to be enjoyable.