Customs import price of Opteka lens to the UK?

I wat to order one of these for my Nikon D90

http://www.amazon.co.uk/...001LZQGJM/

But i found out i'm going to have to pay more to customs when it gets to the UK, i was wondering if anyone has any experience in this or has ordered one and knows how much more i'm looking at paying for it?

You should buy Opteka HD² 0.20X Professional Super AF Fisheye Lens

Included - .20x Fisheye Lens, Lens Adapter, 52mm Adapter, 55mm Adapter, 58mm Adapter, 67mm Adapter, Lens Caps, Lens Pouch
An essential tool for extreme sports and dramatic action shooters
High-index / low-dispersion optical glass, Fully multi-coated, every element
Designed to maximize day and night shots by providing maximum light and image
Made and designed in Japan, Brand new, Lifetime warranty