The DTI has put a redundancy calculator on its webpages. So the dilemma now is do we work it out manually, take the time to pull the paper 'ready reckoner' out a file, or take the time to log on to the DTI site? Personally, I still think manual calculation is quickest!
Incidentally, the DTI calculator is slightly misleading as it says the maximum for a week's pay is £260. It doesn't give any indication that the maximum changed recently, so people with an EDT prior to the 1st Feb may get the wrong figure out of the calculator.