Sadly unless you live in the south-east of England, Heathrow and Virgin are becoming more of an irrelevance.
From my base in
Renfrew Airport (I live on the old runway!) if I want to go west I’ll take the United (Continental) flight from GLA and change at Newark. If I want to go east I’ll go Emirates via Dubai. 3rd choice is London Airways (BA)/LHR and 4th choice is KLM/AMS. The same situation exists for much of the UK, Newcastle and the NE in particular.
Incidents like Friday’s emergency landing for BA leading to cancellations for UK domestic flights only shows how LHR is gearing itself to being the hub airport of Europe to the detriment of the rest of the UK. Reading the proposed Delta/AF/KLM codeshare agreement adds to this feeling, it looks like Virgin can certainly expand by appealing more to Irish and European travellers through their hub. But am I going to fly GLA-AMS-LHR just to get a flight with Virgin? No.
This is exactly why Virgin launched the domestic service from ABZ & EDH but lack of capactiy at LHR will prevent further expansion. However, apart from FlyBe there is another UK airline operating a significant domestic service, I’m surprised there hasn’t been talks with EasyJet to provide thru ticketing.