Other than being very pretty, this look back at the rental prices of spare rooms tells a story that wouldn't permeate the minds of property investors (or tenants) without looking at the data.
Who would have thought the ghettos of South East London would deliver the biggest room rental price increases?
Take a look for yourself here: http://kangaroom.net/blog
It is worth noting that Spareroom.co.uk have traditionally released a monthly 'index' of room rentals. Definitely not as 'user friendly' or pretty, but certainly very factually to-the-point; also includes the average rental rate, which Kangaroom omits: http://images2.spareroom.co.uk/static/rentalindex/2014-06/SpareRoomRentalIndexJun14-posttown.pdf