Thanks for this, tog. Yes, no tax on the Norway price. Do you have a link for the 6.5% import duty for film?
What's interesting is that shipping for 3 boxes (1kg) is 12 Euro, while shipping for 6 boxes (2kg) is 32 Euro. Apparently, they have to ship the larger quantity tracked. Same for 5 boxes, while 4 boxes gives the choice of untracked or tracked, but the untracked price goes up to 18 Euro. Stays at 12 Euro for 2 boxes, and drops to 5.88 for 1 box. Cheapest postage per box, therefore, is on 3 boxes.
If UK VAT is charged at 20%, and duty isn't, the cost would be 91.69 Euro, or about £71.79, which is far cheaper than AG at £97.83 and Maco at £84.78. The only question would be any handling charges by the courier for the addition of VAT. It's tempting to order 3 boxes and see what happens.