New UK VAT Calculation - 17.5% to 15%

This is as much for my memory as anything else, but I'm sure there are one or two of you out there having to tweak a load of code for the VAT change (Thanks Darling).

Old Calc = Gross * 7 / 47 = VAT amount
New Clac = Gross * 3 / 23 = VAT amount