Couple of options. How often do you plan on flying with your bike?
4 times I’m much obliged to the French for putting all the Brit’s running bike guiding out of business, I reckon I can get my MBLA quicker than they can get their IML it’s an ill wind etc etc
The guy at the bike store reckoned using a cardboard bike box was going to be just fine. Otherwise, I’m looking at the Evoc or the Chain Reaction own brand to buy. The Evoc I’m pretty certain I can just sell on Ebay/Ricardo/petitesannonces for 250 chf after using it a few times so that’s a tempting option.
The other option is rent a UK bike but I’m not keen, 35 quid a day seems pricey to me and I wanted to do a few days at Coed y Brenin as well so I draw the line at paying a few hundred quid to rent a bike; I reckon I’ll want 10 days at least over a few months. My other idea is to take my hardtail to the UK and leave it there for a while, in which case just use a cardboard box.