I've just received an email from Eurostar regarding their EuroDespatch service for carrying restricted or oversized items. Essentially, you register your item, they lock it up in a special compartment, and you pick it up at the other end. The key thing is that you can take "Sporting or collector's firearms" for £30 each. What you can't take is ammunition as all flammable and explosive items are banned for safety reasons, but that's easy enough to buy at the other end if you have an EFP. Thought that may be of use to anyone who travels to France or Belgium to shoot boar or other overseas adventures. Certainly it will be for me, as Brittany Ferries don't allow foot passengers to carry firearms onboard. Presumably in case you go up to the bridge and say "Take this cross-Channel ferry to Cuba".
More details here: http://www.eurostar.com/pdf/baggage/...gage_flyer.pdf