reducing polluting cars into cities will work.... of course it will. So IF it isn't having much of an effect then that can only mean one thing...... it does not go far enough.
Be careful what you wish for because if powers that be decide it's not good enough maybe polluting cars will be banned from London full stop, or maybe what qualifies as compliant will be tightened
IF it is slower traffic making ICE cars less efficient that is a problem everywhere because like it or not (I am unconvinced personally) more and more 20mph zones are being rolled out country wide in residential areas. Personally I would prefer more enforcement of 30 other than outside schools and perhaps places like elderly people homes because I believe most fatal accidents occurs by cars.initially travelling faster than 30, but that is just a gut feeling.
but like it or not it's happening.. . pollution wise not an issue however with EVs. the opposite in fact.
Speed cameras everywhere guess? In my town a lot of folks go 35/30 so maybe now they'll do 25/20 better than nothing I guess.