0845 numbers are classified as Non-Geographic Numbers meaning the number does not reside within a specific geographic location. These numbers have fixed calling rates regardless of where the call is made from within the UK. BT's standard and the Index rate for 0845 numbers is 3.36 pence per minute.
Calls to 0845 numbers are charged at no more than 4 pence per minute from any BT line although charges from other operators may vary.