As Gertrude says.
I've also been in syndicates who vary from a rigid checkride system, to (once checked out initially) a "you are a grown up, decide if you are safe but call somebody if you need a checkride" system.
I suspect that the latter actually tends to be safer because it forces people to think for themselves rather than just rely blindly upon a system. But, I'm guessing and may be wrong.
That said, I've flown as "grown up" on a few checkouts with a number of PPLs who really couldn't fly for toffee and no-way was I having them fly our syndicate aircraft solo. I suspect that full-time instructors must get this a lot.
G