I used to have a Citroen but even then I never tried to handbrake turn it
I've found that in a RWD car when you pull the handbrake the power / weight shifts then when you get back on the power the engine being at the front and power going through the rear wheels the engine acts as a pivot point which will then enable you to begin a drift if you so desire to do so which is IMO the only reason why you'd need to pull the handbrake apart from if you're parking anyways
If you do the same in a FWD car I find that it enhances understeer due to all weight being at the front so the car isn't as willing to turn around on itself
I maybe completely wrong but that's what I've always been led to believe,
Although I'm struggling to understand why you'd need to pull the handbrake up to see what it does on a near enough new car anyway
Edit I just googled it and apparently the handbrake turn is more suited to a FWD car than the RWD car so that's my mistake
Apologies