Recently, Andy Lord did mention something about London's tendering system not being ideal, and a potential shift to Manchester style model.
I've suspected this and came to the conclusion some form of area-wide tendering was better, but was slightly hesitant on Manchester's model being replicated as a copy-paste. I'm aware area-wide contracts exist in, say the Netherlands, nothing seems to have collapsed, therefore might be better.
Alas, I will explore, together with you.