There are those waaaaaaaaay better-qualified than me to speak on this, but surely a company as big as ntl has an Employment Handbook? I worked for the Saudi Oil Co. and that had one which ran to about 37 volumes, covering everything in great detail from qualifying for unpaid leave, medical referrals, promotions, pay raises, the annual employee assessment scheme, infractions of company policies, unauthorised absences, and the warning system which could lead eventually to legitimate dismissal. As an example, if you had incurred an unauthorised absence and had failed to either phone in sick for a day, or had taken off several days without a doctor's note, you could be put down as 'unauthorised absence' and not paid for the days you were away. If you obtained a retroactive note from your doctor or hospital, the pay MIGHT be considered for reinstatement. But all of this was spelled out clearly in one of the mighty tomes.
I can't see how a company can expect to be taken seriously if it hasn't produced hard copies of its policies, so that its employees fully understand and accept what they are bound by. Otherwise, every line manager could simply make them up as he went along, some contradicting others. You have to have standard policies which bind everyone, and if you haven't drawn them up, they don't exist.