Holloway
You asked for permissible weather "whilst doing a PPL."
The reality is that you are flying on your instructors licence, either as p/u.t or P1.
So until you are awarded your PPL, the weather will be as your instructor sees fit.
I'd have a chat with him/her to ascertain the current view, as a good instructor will probably have different limits for different exercises at each stage of your PPL.
Hope you're still enjoying it!