As you are looking to do a PPL why are you concerned about CPL approvals? Instructors who teach PPL are unlikely to teach CPL and vice versa
yes but it is more likely (everyone I have seen) that the ppl course has a lot of input from the CPL side of things and the level of standardisation across the full stable of instructors is far better than a ppl only school.
And if the person is wanting to go onto CPL anyway they might as well be over taught to CPL standards from the word go than have to lift there game later on.
Don't worry about porta cabins and the like. Some of the best schools in the country run out of them. And some of the just acceptable ones have swankie buildings. Basically it where they want to money to go. But a swankie building will have been paid for by customers money.