ok 2 miles was what they told me, just checked the map, it's actually 4.5 miles lol those cheeky f*cks.
Anyway I'm onto it, got some ideas from your replies, including---you guessed it---ben_travis's gif.
Bought this clamp for about 3 quid and other bits which are on their way, I'm sure you can see where this is going.
By the way here in China we have loads of public bikes so the plan is to grab one of those, slap the tow bar on, then when I get to my destination take it off and throw it in my bag, so I don't need to worry about a second bike.