Lots of mentions of Bercow’s role

But nothing I’ve seen explaining the basis on which he selects the amendments to be debated and the order they are debated in.

Is it nothing more than based on whispers about which ones have got enough traction amongst MPs? If so, I suspect the great British public might be rather aghast tbh.

I have this vision of him with a big tombola folding up the amendments, putting them in and then giving it a spin before reaching in and choosing one.  Maybe Black Rod does the putting them in and spinning them.