RichM It could work well if they have frequent connections from Old Oak Common to Heathrow and south London, because those places are a fucking pain in the arse to get to off the West Coast Main Line.
You have to go to Euston then across London in a stinking tube carriage to Paddington or Waterloo or Blackfriars at the moment. Utter reg.
Still, I can’t imagine any actual joined-up planning happening from a UK government.