Bought a Sigma Art lens 18-35 mm 1.8 for Nikon and paid £419 when they are well over £600 in the UK High Street. I was twitching a little about possible customs and VAT at my end but it came through ok and was delivered within 5 days by Yodel who are a subsidiary of DHL. It was in a proper Sigma box with all the paperwork etc and is fine. OK Sigma wont touch it under their worldwide warranty not even for 12 months unless I produce evidence of import duty and VAT payment. However, if it goes wrong I will simply drop it in at a Sigma approved repairer and pay for any repair out of my own pocket. Sigma fixed price repairs are cheap compared to Nikon/Nikkor. If I had to pay for 3 repairs I would still be in pocket. VAT is a Euro tax that is why I welcome Brexi