Hi Amrik,
It's always lovely to be able to answer a question from a fellow Brit.
I have seen hair braiding/wrap stands at many of the Disney Theme Parks, Disney Resort hotels,
Disney's BoardWalk and
Disney Springs, over the years.
The stands do seem to come and go quite regularly but at the
Disney Resort hotels, you'll generally find them located poolside.
If this is a must-do for your family during your visit to the Walt Disney World Resort, I would recommend that you stop by the Concierge Desk at your Disney Resort hotel when you check-in, or at
Guest Relations when you visit one of the Disney Parks (if you will be staying off-site), where a Cast Member should be able to find out the current locations for you.
Wishing you a magical holiday filled with memories which will last a lifetime!
Emma