What could be... One (cheap) traffic calming solution would be to allow parking bays on Bellenden road between Chadwick and Choumert road. This disportionately wide section of road allows cars the space to speed. One way of limiting speeding would be to narrow the road by allowing car bays. These need not be ugly as the photos show and could support the local businesses by allowing customers some short-term parking.
This could also be done on Bellenden road between Holly grove and Chadwick road; where again the road is very wide for a single lane of traffic.