Well indeed. The TfL route network is full of things that ought to have been revised 20 or more years ago, but have just been habitually repainted in what provisional manner was laid out in the 60s.
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Given that the direction of travel with the railways is the opposite - with more routes, to outside of London - being handed over to TfL, I suspect handing roads back is unlikely. Even if HE wanted them!
The only viable long term solution is to build the M31. This would relieve J10-15 of all traffic from the channel ports and points south of London, heading to the southwest, Bristol and South Wales. Given that we seem to be tentatively thinking about more ambitious tunnelling schemes, the M31 could be constructed with a tunnelled section under Horsell/Woking which is the main sticking point for the route.