Yes you can protect your ideas (sort of) by registering them. Note that it won''t help you very much, if someone steals them, you still have to fight him with good lawyers. But registering helps you to get the author proof you need in such a lawsuit.

In Belgium it''s the SABAM, in France the SAVAM, in Germany the GEMA. Don''t know about the UK, though, but it''s something similar.

Registering a company name is something different, you need to register a trademark. You already need a valid company for that (an ltd. in the UK, I think, or an incorporated), and it will cost very much. You will need to do research about existing similar names, and need a very good (an expensive) lawyer, if you want to be on the secure side.