Cornforth White would be good with the paper, or if you wanted something more subtle, Skimming Stone.
Personally, I wouldn't go for Joa's White - too warm against the paper I think.
If you look on the internet, find a F&B stockist close to you. Any of the independents (i.e. not Homebase) usually have someone who can give good advice, and you can bring a sample of paper in, along with photos of the room.
I always buy my paint at the interior design shop ten miles away, rather than Homebase, which is 2 miles away, because of the advice they give.