As of now no.
This kind of question is almost impossible to answer... There is no 'register' of gyms in the UK - new gyms are opening daily, and old ones are being closed.
I did parkour yesterday. I am doing parkour today. I will be doing parkour later on today.
The definition of parkour is individualistic, practitioners of parkour define parkour in their own way. However, all people can agree parkour is the freedom of movement.
David Belle is the founder of parkour, but no one 'made' parkour.
I would not rely on just watching parkour videos to learn parkour from. You have to be in tip-top shape to do parkour. You do not want to break anything.
Parkour can be start by run.
usually
there are no age limits in parkour
At Houston parkour school
yes u can do parkour but only with mods
because im love a marshal art like a Parkour