i looked into getting a proper rack that fits over whole length/width of the boot. was VERY expensive and pretty cumbersome. think it was the boofsquire one.
event looked at a custom fabrication from a mate. but it would have looked crap and been hard to adjust properly when getting on and off.
there is not really many options, sorry to say.
best option is to ship your stuff to the UK i would say. probably cheaper.