I know that Ilford make the papers in 11x14, but most of the online retailers I use don't seem to stock it. They jump from 9.5x12 to 12x16. No 11x14. (I don't have any decent camera shops nearby - they are all digital and think you are crazy if you ask for anything else - so I buy almost everything online.)
I will try Morco who do list it and have an easy ordering system. I hadn't heard of them before. Thanks, Trevor.