That's the great British weather for you
It has always been the same, and always will be. I've been lucky enough to fly on some gorgeous days recently and cancelled flights / altered destinations due to nasty grey stuff on others.
If you really want to get the PPL you'll keep plugging away and using the time on the ground when the weather's rubbish to chat to your instructors and fellow pilots, maybe even catch up on a bit of the studying and get the exams out of the way.
If lack of instructors is an issue, perhaps you need to take your custom elsewhere?