A few years ago, I wangled my way into a teaching job in FE. As you say, you are required to 'hold a teaching qualification'. In my case, it was C & G 7307 - the most basic requirement. (Let's face it, only a mug would get a degree and waste it on teaching).
I got my qualification at Sheffield College and it was the most corrupt, manipulated course I've ever been on. Basically, if you turned up (3 hours on a Wednesday afternoon for 12 weeks), you were guaranteed to pass.
Even if you didn't turn up, you passed. Some wasters from a Council-Tax-squandering outfit called the Darnall Music Workshop missed the first week altogether. They turned up for the second session an hour late (cue the 'tutor' saying 'Better late than never!' ) After that, they were never seen again. They passed.
And that's the problem with 'education' in this country. The teachers/tutors pass as many as possible 'cos it makes them look good. They don't seem to realise that some of the people they're passing aren't fit to run a whelk stall. And so it goes on.