So I've lost the "easy" 2kg in a week (and 5cm off the waistline) despite not really going for fasting in a big way.
Have been skipping lunch some days, cutting out snacks, cutting out booze most days too. One other change is stopped taking milk in tea and coffee. Now have black coffee and black tea with a slice of lemon. Given the amount of these beverages I consume daily that has probably saved hundreds of calories.
Going by experience, crossing the 80kg threshold will be the most difficult. For that I will probably need to do 5:2 properly as well as all the stuff I'm currently doing.