At the Bruges Railway station (West-side) a new international bus stop has openend. It connects Bruges to London. In about 5 hours and at a very cheap price (between 13 and 17 euros) you can travel to London with FLIXbus. You can book your tickets online at Flixbus.com. You can book for the journey to half an hour before the departure of the bus.
https://www.flixbus.com/bus-schedule-bus-stop/bruges
Look at the map below for the exact location of the bus stop at the Bruges Kiss&Ride zone, Rijselstraat-Spoorwegstraat
8200 Bruges
Belgium.