The two-hour, feature length episode will air on Christmas Day (Monday, 25 December) on ITV at 9pm.
You can have all the good advice in the world coming at you when you've just been through a relationship break-up.
Yet somehow, as Sex and the City's Carrie found after her numerous goodbyes with Big, that doesn't make coping with your heartache any easier.
Here are the Golden Rules that will help make being dumped just that bit easier to bear: Rule 1: The time it will take you to get over your relationship is equal to the total time you spent together This rule is as unshakeable as one of those long and complicated mathematical theorems.
So there's no point in whinging: 'How long will I feel like this?
The fact that you're radiating happiness, even if you're feeling shattered inside, is the sort of news that travels back to your ex with gratifying speed.