17.5% yep (unless they offer a VAT refund which some do... you may even find your package comes thru' labelled "reconditioned goods" or something in an attempt to bypass customs

)... remember it's one hell of a lot easier to return stuff that's bought here... your credit card should give you all the cover you need... oh, & make sure you give it a try over here in one of the high street shops yto make sure it's the lens you want... you never know they might even cut a deal if they see you're walking away from a sale!
