The phones here at work will not allow a 0845 number to be called but will allow standard numbers (i.e. a national rate not local rate phone number) to be called. I remember seeing a website that allows you to type in the 0845 number and it would tell you what the alternative (none local rate) number is.
Does anyone know this website or perhaps another way of finding out. I've tried googling this but all I get is sites that offer 0845 numbers.