BA/IB not interested in the UK regions.
Too simplistic. BA need the regions from ABZ/EDI/GLA/NCL and points European to help feed long haul at their main hub. Their would be no profits without the loss making short haul routes, however odd that sounds.
With MAD as the second BA/IB hub, there is no reason to suspect tha given a business case for enough feed that it would not become a focus over time to serve UK points beyond LHR.
BA are not interested in regions point to point. I'm sure I've mentioned this....