I just found a lovely leaflet from the (Liberal) Eighty Club, promoting the Progressive Party at the 1892 London County Council election. It calls on Londoners to:
Shake off the sloth with which you are reproached in public matters, and which makes your friends despair of you, and your enemies despise you. Come to the polls and exercise your rights as free men in favour of the freedom and power of London.
Would that kind of forthright approach work today? Well, maybe Boris and Ken are missing a trick – the Progressive Party won by a landslide!