This will set you back in proficiency every time. I don't think many people on a part-time course will achieve their PPL in the 45 hours required.
Thats a point worth considering, if you are doing the UK PPL to a good standard the average is about 10 hours longer, I know some schools who have no problems with 45 hour courses but I know they cut some corners and gloss over a few lessons. Yea we covered that inn XXX exercise we will just tick that off etc