No, you don't deduct the fibre on UK products as the carb count on the label doesn't include fibre. That's only the case for American food labels.
You have to be careful of things like ham if it's the processed kind as some have sugar and fillers in, bulking the carbs up. Always check the carb count on the labels. Same thing goes for mayo, some are higher than others.
What veggies did you put in the salad? Most salad veg is okay, but some can be a bit higher in carbs. Like, if you had grated carrots or something like that.
Also, just to be sure, did you put milk in your eggs when you made the omelette? I know some people do and milk is pretty high in carbs, so that could bulk it up.
The problem I find with MFP is that most of the info is user-inputted, so some things can be pretty inaccurate. I find the best way to do it is just tally it up yourself from the food labels. It's bot as easy or quick as MFP, but at least you know it's accurate.
It's pretty time consuming reading labels and working it out in the beginning, and you'll probably find your shopping trips take twice as long! But when you get into the swing of it, you'll know what you to get and what to avoid and it'll become a second nature to you.