The 20 mph limits can work in quiet, narrow residential side streets where there is local consent, but London’s Labour Mayor and boroughs are increasingly inflicting them on wide roads and main roads where they are not justified. Now Barnet Council wants to introduce a big 20 mph zone in Whetstone without adequate consultation. Will the Secretary of State intervene to ensure that these speed limits are introduced only in appropriate circumstances, and only when they have strong local support?