I have the Nismo grill
the only one in the US I think....
Luke got it for me, cost was $350 (Nismo is very expensive, and then all the shipping etc added onto the price)
The box is small, maybe Luke could ship you one to the UK for a little more than I paid, still better than $645... it'd be more like $400.
Its pretty cool, the center is removable, comes with all hardware needed, very good instructions (lol, as if I can read Japanese) and an authentic Nismo certificate
took 2 months to get it...