I regularly drive to Bromley and use Perry Vale. I often use Westbourne Drive to avoid northbound traffic on Perry Vale caused by a narrow street with inappropriate parking.
I used to live on the other side of the footpath connecting Sunderland Road and Trilby Road, so I have been a regular pedestrian in this area of Forest Hill.
These days I tend to avoid Sunderland Road when driving due to the height of the humps, but I also remember before the humps were there (we’re probably talking at least 25 years ago) it was a very busy road and residents suffered from too much traffic and inappropriate speeds on a residential road. At that time it wasn’t such a pretty or desirable place to live due to rat-running and excessive speed.
The second to fourth edits of the original post included removing the humps on Sunderland Road. Traffic would then go considerably faster than 30mph. So to make this scheme work we need two new sets of traffic lights, replacement speed humps with pimples and tables, add a zebra crossing by the school.
Alternatively we could demolish the taxi firm and widen the junction between Perry Vale and Waldram Place, while pedestrianising (or making one way) just the last part of Perry Vale between Waldram Place and Waldram Park Road. And add a zebra crossing to the newly aligned road.