Sadiq Khan must learn to be shameless like his predecessors Livingstone and Johnson and revisit the subject of TfL taking over at least some Southern services. When I say shameless, I mean in the sense of seeking the chink (gaping hole, more like it) in the armour and getting in there with a flashing rapier, or whatever analogy. Never a better moment - don't delay, Sadiq, let's see what you're made of.
Given that Brighton and some other south coast constituencies turned left, the Conservatives might take a stand-point along the lines of "stew in it".