According to the listing the camera is in Manchester, so since it’s a transaction between two EU states, you won’t be liable for VAT. You may be paying UK VAT in the price, but that’s between the seller and UK revenue – our lot can’t come after you looking for more.
You probably won’t get the cashback from Canon with that and you can order it from the UK for the same (after the Canon Cashback) and also have a proper warranty. I was going to order mine from one of these ebay shops but then got it from Jessops for pretty much the same price, they’re doing ?10 off cameras and another 10 off memory cards some of which are already reduced when bought with a camera plus you can bring it back to Newry or Belfast if something goes wrong with it.