"how can i avoid import tax?"
You're not supposed to. That's why people move out of the UK to America and tax-havens. On second thoughts, you might double check: I believe there is some legislation in the UK declaring that digital cameras are exempt from Value Added Tax; film cameras are not. It sounds mad, but this is how 'pro-digital' British policy is. I heard that this was the case with the largest off-shore photographic supplier for the UK mainland which has wiped out most of the competition for prices for film; digital gear and batteries because of the tax issues.
"can i get bh to send it as a gift?"
You can but try..........I'm just wondering....doesn't that make you feel a little bit noughty? Just a teeny-weeny bit? A smidgeon perhaps? Ack, who cares....other than Customs...
What happens when things are sent overseas- do customs open up everything?!
Everything that comes in goes to Mount Pleasant which is actually very unpleasant. The bills mount up as inspection fees; value-added-tax and clearance fees are lopped onto your items. Even gifts which are over a threshold are subjected to the same procedures in customs: sending a valuable gift does not exempt from taxation.
B&H will not be able to send it unsolicited and there is always a risk that your item could be billed or miss the screening altogether.
Save the dosh and take a cheap flight to NY and go shopping - ditch the cardboard in America since Americans recycle things and the Brits are slower on the uptake.
Alternatively, you might want to look at one of the internet shops in the Far East which sells cameras at prices which undercut
B&H......they do specific sales with foreign customers.
Does that help?