Camera

I've bought from the US and I had to pay duty (although I bought it from Adorama and they are very much "by the book").

Can't you get it delivered to a friend in the US (make sure it is a different state if you want to avoid sales tax) and get them to forward it to you.

sales tax is charged in the state of purchase, they fixed the loop-hole, aim for a warehouse in middle America.

Your in London, go to the best Nikon shop in the world, Grays Of Westminster one of the two camera shops I have been too where it is honestly wroth paying for the service.