That is the Eurostar train from Paris Gard du Nord to London St Pancras International. It operates frequently
and the journey takes about 2 hours 15 minutes. The lowest price tickets should be booked well in advance
www.eurostar.com
There is only one train from London to Paris because it has to go under the channel. The Eurostar takes around 2 hours. Book well in advance to get the good prices because it can be expensive if you don't. It may be cheaper to fly with a low cost airline. If you have a car then the EuroTunnel is a good way to travel. If you are going to Brittany then Brittany ferries overnight is also a good way to go if you can get a cabin.
There's no hour train; there's the Eurostar which takes just over 2 hours.
Whoever said that was forgetting about the time differential. The 08.43 from Paris arrives in London at 10.00 - which looks good, but is actually 2 hours 17 minutes.
the Euro Star takes about 2 Hours
http://www.eurostar.com/us-en/eurostar-d...
The Eurostar, but the quickest journey time is around two hours.