TfL have a consultation open over making all their roads (i.e. red routes) 20mph...
https://consultations.tfl.gov.uk/streets/20/
Edit: On closer inspection it's limited to central London, so not as significant as I first thought.
Signs, more speed humps, removal of centre line and road narrowing. Given the zero enforcement of 20 mph zones this seems a lot like a net loss for cycling comfort.
@Brun started
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TfL have a consultation open over making all their roads (i.e. red routes) 20mph...
https://consultations.tfl.gov.uk/streets/20/
Edit: On closer inspection it's limited to central London, so not as significant as I first thought.