London has been a bit of a nightmare so far. Uncontrolled Rioting and Protests, a militia parading in Brixton last weekend, inconsistent or no application of lockdown in some areas, and crime rising again. Let alone TFL running out of money. Mayor Khan's lockdown is making our Govt's effort look wonderful when we know it's very far from that.
The proof from other areas is the local political scene have struggled to enforce hard lockdowns (perhaps in regards to looking at electoral futures or offending people), so it has needed the Govt to make the hard calls to ensure COVID doesn't spread further. If Khan had better control of London, Boris and ok wouldn't need to take control.