I went limited as I found there was far less red tape with all this. My accountant dealt with this side of the business as I rented space above a hair salon, then sub let rooms.
As long as the tax man can see see clearly that the rent paid is covering everything, and that what it isnt covering is being paid by yourself then theres no probs.
The girls I sub let too were also limited companies that paid a rent per room per day that I invoiced them for. They paid their own Tax and NI.
As I am employed by my own company I pay my tax & Ni through that.
I had my solicitor draw up contracts so all the people I sub let to on various days were made to be responsible for thier own taxes etc.
With regards to utilities, I rented 2 storeys above a ground floor shop that used to be an entire building. We shared one leccy meter. It cost me £500 to have them split so I could get builed seperatly. I only did this because the shop was turned into a restaurant and they wanted me to go 50/50 on the bill! The cheek!
I am a member of a couple of local business and networking clubs. It works out well because there are always PR companies, accountants, solicitors, bank managers, printers etc their that you can become 'friends' with! It means lots of free advice on stuff like this and often huge discounts for their services!
Kate