Eurostar tips 

NOTE: I HAVE BEEN INFORMED IN AUGUST 2021 THAT BIKES ARE NOT CURRENTLY BEING CARRIED ON EUROSTAR UNLESS DISASSEMBLED,. PLEASE ENQUIRE WITH THEM FOR THE LATEST INFORMATION

• For official info about bikes on Eurostar click here   . (OR AN ALTERNATIVE RETURN METHOD FOR LARGE GROUPS)
• Although Eurostar can take only a limited number of bikes fully assembled, they now provide boxes and tools that allow you to disassemble them and put on train where this option not available. 
• Choose from two options: either book as baggage (£25 a bike) or check it into the goods compartment of the same train as you are travelling on (£30). Both require giving it in to the luggage office. The baggage option sends it on a train in the next 24 hours, and you pick it up in London. If you leave soon after checking it in, you may get to London before your bike and have to return there. On the other hand, if you're spending some time in Paris, this gives the option of looking round without your bike, then having it waiting in London when you're get there (they'll keep it for about two days).
  
• At Gare du Nord, the bike checkin is some way from the main station concourse, so I recommend leave an additional 20-30 minutes if possible to find it, check your bikes in and walk back with your paniers to the passenger check-in. The check-in is located about 600m from the concourse on the left hand side of the station. You can get there by going alongside platform 2 or from Rue de Mauberge.  Follow small signs to Bagages enregistres Eurostar/Geoparts/Sernam" . It's in a gated courtyard.
• In London, the pickup is at the Eurodespatch office off Pancras Road - turn left after coming out of the station. It's a bit of a trek and closes at 10pm.