You lot are a bunch of saints. Thanks for this, it's extremely helpful. Now I get to procastinate over what I want exactly.
To be honest, after paying £85 for the Halfrauds effort, the prices of these recommendations seem shockingly reasonable.
I considered the tow ball one, but I wouldn't use it often enough to make it worth getting a tow ball fitted just for that, and my spacial awareness isn't fabulous (ask Kim about the Easter a couple of years ago that involved me trying to parallel park with a helpful churchgoer doing lots of gesturing to help me manage to get the car in the space), so I can foresee pain with that, probably involving some berk's penis extension of a car.
Roof isn't entirely practical as getting the bike up and down on my own wouldn't be easy. Perhaps this is why people have teenagers, so they can be pressganged into duty for such times as this?
I had
this one from Halfrauds. My first mistake was probably trusting them to fit it (though it did make returning it easier). I was dubious about clamps only (in hindsight, that's because it wasn't actually fitted properly), though I suspect it might have been better with a few straps giving it extra security in the right places. But given that particular one didn't do the job for whatever reason, it was going back whatever.