For me: 2019 normal however with a minor change:
Banning domestic flights (except those to Northern Ireland and islands cut off from mainland UK such as Isles of Scilly), and short distance international flights (such as those to Paris, Amsterdam or Brussels, for example) and having more trains to replace them. That way, international (and long distance domestic) travel can be kept like before, but in a more ecologically and environmentally sustainable way. Instead of more unnecessary domestic / short distance international flights, we should have for example: more Cross Country trains (and electrification) for domestic travel, and more Eurostar trains to more destinations (maybe Bordeaux or Frankfurt, or even all the way as far as Spain or Italy?) on the European mainland for short distance international travel.
And, hopefully, in about 20-30 years time, having the Japenese Shinkansen L0 Series maglev supersonic speed trains (the one that reached the world speed record of 603 km/h) replacing long haul flights! They can apparently go 643-804 kmh - that's only 100 km/h less than a regular plane in flight! Although of course building the infrastucture can be very difficult and very expensive, costing billions, if not trillions of money. Especially if you want to build a route across the Atlantic Ocean...