London to Istanbul, Need bikes.
 

Hi all - My eldest son is getting married in London this August. After the event he, my youngest son and I are thinking of riding to Istanbul... where the groom's bride and Mum will meet us via air (after his honeymoon of course. else that would be wierd)... We are from Australia. I'd need to rent (or borrow) three bikes. Even worse, it would be one way. Has anyone every heard of an airbnb service for bikes? Sort of like a bike swap service like a house swap? I'd be happy to lend my bike out in Aus... Even as I write this I am realising how impossible or super expensive this would be. Just wondering if anyone has a any brilliant ideas? Thanks.