Filing Annual Returns, if that's really what you meant, is a really easy procedure. Filing annual accounts, a different thing entirely, which is what I suspect you meant, you need to know what you are doing. You are still miles out on the timing though Chris.
When I started as an accountant in the early 90's ALL companies did require audit, you are right but they started phasing it out for small companies shirtly after. First those with a turnover under �350k were removed, then those under �1m and later it was moved to �5.6m and is now up to over �6m. This all took place way before 2005.
All of which I'll grant you is still nothing to do with answering the question.
Dabaadsha, I never claimed I was answering the question, I was addressing an error in Chris's response. Chris for his part was advising that setting up a number of companies to operate different trade names would be completely pointless and unnecessary. I agree with him.
However, to directly answer the point as regards naming then it would all depend how confident you are in "the brand". There's only a point in the word association of the different companies if it yeilds positive pr. If there's a chance one companies bad publicity could reflect badly on the others you wouldn't want to highlight their connection.