Call forwarding.

This is a bit random – but there are smart guys here – maybe you have the answer?

Is there any way to set up a geographic phonenumber to automatically forward to a different number at different times of the day? i.e have it set to automatically route the number elsewhere between 5 and 6 for example .

I have seen stuff that lets you do this with 0800 numbers and the like – but not normal phone lines. It is a BT line – but we could switch to another provider if they had this service.