1A good-sized worktop - it doesn't have to be fancy but must be big enough to carry a computer and printer, plus sundry scatterings of documentation

2A designated phoneline (ideally with broadband)

3A well-designed chair - you don't want to develop back problems

4Lots of storage and a filing system that's constantly kept up-to-date

5Minimal visual distractions: working alone, it's very easy to allow your attention be diverted by anything and everything - keep your office decoration plain

6Self-discipline, tidiness and the ability to structure your day