My PPL instructors were very poor, the school, not surprisingly doesn't exist any more. Being naive I trained where it was cheapest and when it came to BCPL training I really struggled as the foundation for flying at a higher level just wasn't there. I got there in the end and past the GFT first time but at the cost of a few more hours than my peers at the time.
I guess the moral of this story is dont always opt for the cheapest as you will ultimately pay the price.
MJR