Thanks for pointing that one out. Had been thinking of something on the boot rather than roof but may reconsider.
The beauty of roof mounted is that you can get easy access to boot. I had a boot mounted one and it was a pain as it was secured through straps which then threaded under car to strong point (towing hook). You couldnt open the boot with the weight of the bike on even if you wanted to. Ok for journeys where you dont need boot access but at least on the roof it leaves boot free for other stuff.
"Would anyone else rather be doing something other than marching up and down the square????"