I suspect there might be some comments as this is Saverstore (was Savastore, which went bust a couple of years ago), so I waited until I received my lens before posting just to make sure - but this is an absolute bargain.
I got this lens for £477.03 delivered less £14.00 already tracked through Quidco - so a net cost of £463.03.
Same lens is shown as cheapest at £539.99 on camerapricebuster.com, costs £589.99 at Amazon and £649 at Jessops.
The lens was ordered on Friday, dispatched the same day, extremely well packed and couriered next working day to arrive today - and it's amazing quality, comes with Euro warranty stuff, so no signs of it being a grey import either. Even cheaper than the companies shipping from Hong Kong,