Carvery Calories

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Hi all I have just had my first meal out and opted for a carvery instead of my usual steak and chips. I have guessed most weights (although I did bring a potato home to weigh) and used values on MFP to put it in my diary. I was just wondering if any of you had any opinions on the kcals it came to as the meal seemed quite small ( only used 3/4 of my plate) but came to 750 ish Kcals. I ate 5 roast potatoes (the one I weighed was 33g), 2 thick slices of lamb, 1 slice of gammon, meat gravy + mint sauce and I had a pint of lime and soda water too. Do you think this is an accurate guess at Kcal consumption? How many Kcals do you think were in this meal? You can view my diary if you like to see how it all adds up. Much appreciated!! (this is making me want to go out even less where I should have enjoyed the meal I just worried) :(