flyteam only hire from Elstree
they train from Cranfield
Cabair are young journey boys .........
I did my PPL with them in the 90s and went through several instructors as they are mostly out to gain sufficient hours until they can join an airline.
The last one (he was also the most mature but he went off to fly for fly-be after having been the Sunday Times cricket correspondent) was the best.
Flyteam - you get mixed reviews about them. You either like Amir or you don't. Personally I like him a lot. But he has a strong character and puts up with no bull. Might not be everyone's cup of tea.......
if you do go for cabair, you may pay more than elsewhere, but you will get your PPL. If you don't mind going to Cranfield, then I would chose Flyteam.