I cycled through Dulwich yesterday (in the hail) for the first time since it used to be part of my commute a few years back. I was surprised that Court Lane had been LTNd, because I don’t recall it being a particularly heavily used rat run when I used it to get from Dulwich to Lordship Lane.
The road I live on was though the absolute definition of a rat run and ours was sealed off last summer, with planters and drop down bollards. There was a lot of huffing and puffing about the queues that would build up on the alternative major road, some specious arguments about it diverting traffic past a school (a secondary school that was still on the main road before the LTN), and of course people started dropping the bollards. Then the council padlocked them, which seems to have worked for the main rat run to the high street. Unfortunately one of the residents next to the other one does car repairs on the street outside his flats and took the opportunity to move all his bangers back as well as frequently dropping the other bollard. He seems to have had another bollocking because it’s not been dropped for a while now.
I think it’s great, and so do just about all my neighbours. On related matters I spent a fair amount of time yesterday cycling round Central London near the river and was amazed by how much segregated cycleway there is there now. It’s very slow going, but unimaginably safer than it was back when I used to ride in London regularly.