Just use your common sense. Contact the hotel to find out what they provide for breakfast first - I was away for the weekend and the hotel had melon, weetabix, eggs, tomatoes,omelettes, wholemeal bread, beans etc. Dont be afraid to ask for things to be cooked for you without oil.
Lunch could be subway salad or jacket potato with beans and dinner you could go to wetherpoons, pizza express, harvester etc
You know the things that are high in syn so just make sensible choices when you eat out and take some SW supplies with you eg alpen lights, mugshots, couscous. We have supermarkets in Edinburgh too lol so you can buy fruit and yoghurts as you need them. Where are you staying?