It will increasingly do so the more the railway infrastructre will get improved. It is interesting to see how domestic flying has changed in France and Germany since the opening of HSR lines. given the relatively small size of England most South-East-bound traffic from MAN, LBA, NCL, GLA, EDI will disappear. The interesting part will be if, like in France, domestic feed to LHR will still be provided with smaller planes or if, for the sake of freeing up precious slots, LHR can be properly integrated into HSR in the same way as it has been done at FRA or ZRH.