I don't know if this is relevant or not to the election result from K &C, but it was always my experience that as well as the very rich, there were also large numbers of what we used to call council tenants and indeed some huge council estates. Anybody remember the TV. Prog called (I think) The Hidden(?) Sreets of London " which highlighted the extreme social differences between two ends of just one road in Notting Hill.
This is from the K&C website.
Kensington and Chelsea is one of the most popular areas to live in the UK. It is one of the most densely populated boroughs in the country, with an estimated 158,700 people living here. According to the 2011 Census figures about 25 per cent of households live in social housing (which includes homes rented from the Council and housing associations), and 36 per cent live in the private rented sector. This is much higher than the London average. With such high demand and a shortage of accommodation of all descriptions, house prices and rent can be very high.