Some links to useful websites: 

There are 2 good websites offering online maps of London:

http://www.streetmap.co.uk  http://www.multimap.co.uk

Up My Street is a website that will give you statistics about every street or postcode in London. 

http://www.upmystreet.co.uk 

A good website about Vauxhall and Kennington:

http://www.vauxhallandkennington.org.uk/

We recommend World First for all your foreign exchange requirements when buying properties in another currency: http://www.worldfirst.com