Hi Rob,
I'm currently looking into getting my spare on the roof as I often take the dog out with me, and with a box of 'supplies' in the boot as well as the spare, it doesn't leave much room for her! I also want to secure the hi-lift on there too...
Depending on how much it ends up costing, and whether I can bodge something up in the meantime, I could certainly be interested...
Thanks,
Jon.