This specific configuration is for a commuter train, but similar trains (which can be coupled to other sets) are used on long distance routes in the UK.
As I said, the UK isn't really high speed compared to Europe. Other than the Eurostar line/HS1, all other lines throughout the UK are limited to 140mph (225km/h) or less.
Many local trains in Europe have a similar design, and a similar top speed.
The long distance trains in the UK do go faster and have an angled front.
It's presumable a trade off between aerodynamics and walk-through ability when connecting trains.