Hi Bobby and Welcome to FBF
I have used all kinds of 08 numbers with no serious detrimental affect, although if you are selling B2C then consumers can sometimes be wary of any non standard number.
Have you spoken to BT to ask about having a second normal number on your line? Not sure if it is still available, but they used to be able to offer that and your phone would have a different ring for the second number so that you could identify business and personal calls.
Hope that is some help. Look forward to hearing more from you.
Please do make yourself at home.
All my best
IP2