Did somebody need some fireworks p!ssing on... 
  The following applies if you intend to work for one company for an
 extended period of time, not if you're likely to have lots of 
 different clients.
 
 General:
 No pension
 No holidays
 No sick days
 Limited job security
 
 At work:
 Fewer employee rights (depending on how long you work for the client)
 and don't they know it.
 You usually have to take any work offered, regardless of how crap it is.
 
 After a while everybody gives you hassle at work because you earn more
 than a permy doing the same job.l Even if it's not that much more they 
 think you earn a fortune.
 
 You're everybodys' fall-guy, scapegoat, etc when things go wrong. Less 
 chance of getting senior permanent roles in the future due to your 
 contracting background (debateable, but my experience to date).
 
 Running a ltd company:
 Even with an accountant you still have to do quite a lot of
 paperwork/filing.
 Difficult to get a mortgage without 3 years accounts (unless you're willing 
 to compromise).
 Dividends paid quarterly so you tend to live off an overdraft.
 
 And lastly there's IR35......