Joel's answer on "If I'm working at a company, do they have intellectual property rights to the stuff I do in my spare time?" certainly was an interesting read. However, it was pretty much centred around USA law.
Therefore, I ask you: what is the legal situation regarding code copyright and side-projects in Western Europe (specifically Germany, the Netherlands and the UK)?
PS. Since the original question was asked on OnStartups, I'm asking this question here as well.