What size gap at bottom of stud for ply/PB

[janieJones123]

Hi,
I am building a half stud wall that I will be covering with 12mm ply and then plasterboard, then adding skirting once it’s had a skim. I was wondering if I need to leave a gap at the bottom of either covering like you would on a masonry wall? I would think not to leave a gap for the ply, but maybe an inch or two for the plasterboard?
Thanks!

 

[foxhole]

No need for gaps.Though makes lifting tight to ceiling easier.