Sure this is the most common question posted here but...

I don't mind registering a company but if I don't and I choose to stay a sole trader for a while, can I still use a company name and have a logo on my busines cards?

My business idea involves manufacturing an alcoholic product and then (hopefully!) selling it on to licenced establishments and eventually supermarkets - do I need to be registered before then? To be honest, I can't understand why anyone would want to register at all - it just seems to mean you have to pay an enormous amount of tax and keep more records! When do you HAVE to become registered? I know it looks more professional to be a Ltd but is it ever necessary?

Final question (I promise!), I am still working full time and so cannot start my business in my own offices. My tenancy agreement says that I can't do it from home either - so if I rent a PO Box is that OK until I can afford to rent actual offices?

Thanks in advance!!