Any student who wants to do some spinning just needs to ask their school. Most can provide this training either pre or post PPL.
Whilst most schools can
provide this, I would be a little cautious over who you do it with, these days many schools do not have instructors who are that experienced in spin training, and many who do will be using aircraft like the C152 which, though cleared for spinning, have characteristics that are not ideal as spin trainers. Idealy you want an aircraft that can be put in a spin without a flick entry, stays in the spin whilst the instructor points out WIHIH, then recovers with standard spin recovery. If a school teaches Aeros (preferably not
in a C152), or advertises
spin training they should be fine, otherwise, there are plenty of schools that DO specialise in this.