Hi Luke. Good luck with importing one into Sweden. Do you want a left or right hand drive car though? I'm not sure how many UK dealers could source you a left hand drive car at a discounted price.
I bought mine from
www.allbrandsnew.com . Couldn't fault them in terms of the price or the service. They're in Hull as well, so could be fairly convenient for the ferry across the North Sea!

As for others, there's:
www.coast2coastcars.co.ukwww.virgincars.comwww.uk-car-discount.co.ukwww.jamjar.comwww.dccook.co.ukPrices and delivery times will of course vary between sites, as may the fact that the car will be pre-registered.
Also, take a look at
www.honestjohn.co.uk . Its the website of the motoring section of the Daily Telepgraph. The newspaper is crap but the site has loads of useful information and links on it about where to buy.
Hope that helps!
