This passage from the press release is really interesting and I presume applies to BA as well...
Heathrow's Chief Executive, John Holland-Kaye, added: "Improving the connections into Heathrow from all around the UK will be vital in helping to secure the economic future of communities in every corner of the nation. Today's announcement shows that the measures we're introducing, such as the £10 reduction on domestic passenger charges, are already working to secure vital links. More airlines flying routes to Scottish airports means more flights, more competition and choice for families, and more visitors to Scotland. With Flybe based at Terminal 2, it also means new, unique direct access from Heathrow to markets such Colombia, Taipei and Auckland - meaning more opportunity for Scottish businesses looking to reach new export markets."