I live in one of the EU countries and in about 6 months me and my girlfriend are planning on moving to London. I am a software developer. I was planning on getting a job before we actually move there, but I don't know when to start looking for one. I think now is bit too soon, as I'm unlikely to find a company that would be willing to wait for me for such a long time.
The reason we are moving in six months is that we both have some obligations here that we need to fulfil (current jobs) and we would like to save some money in case we wouldn't get jobs before we move (and could live off of those savings for a couple of months and search for employment once we are there).