I found it on a property search engine, which then put me in contact with an agent. Not cheap doing it that way though, and estate agents are terrible, they'll inevitably make a hash of it somehow! That said, there aren't many alternative options, but you might want to have a look on gumtree. You'll find a lot of crap on there, but you occasionally unearth a gem, it's how I came across my place in Soton, and it would cut out all the crap you'd have to put up with from agents. Defo worth looking around though, because there's no shortage of decent places in London. None of them will be cheap, but some will be drastically cheaper than others, so worth taking the time to have a decent look.