Wing clipping or not?

Hi everyone, I am hopefully getting three light sussex bantams to live in my back garden. They will have a run but i'd like to let them out in the garden when the weather is nicer and i can spend the day outside with them. Should i clip their wings? Or should they be ok? I have 7ft fence all round the garden.

I have some bantams that sleep in my trees and can fly high so if you don't want this then it may be best to clip just one wing on each.