Being a graphic designer I am obsessed by paper and card but frustrated by the lack of availability for letterpress in the UK and I still can't find a supplier of Cranes Lettra :( well not for the hobbyist). So as a troll through the web I've decided to make a list of my finds in the UK, you'll find it down the right hand side. IF ANYBODY OUT THERE KNOWS OF ANY GOOD PAPER/CARD SUPPLIES, LET ME KNOW and I'll add it to my list especially if its a little different!
SOMERSET 100% cotton
Falkners in London have a large range of bookbinding supplies and supply mail order and they also sell the acclaimed Somerset papers in large sheets plus lots of other printing paper, Colorplan, Bier, Ellie Poo, Chromolux just to name a few, all sold in large sheets. Lawrence Art Supplies have a good range of printmaking paper including Somerset and also tell you whether it's suitable for letterpress.
Paper 2 Go is the retail division of GF Smith papers you can order online and they have a factory shop in Hull (no where near me!) Some very nice paper on here which is mostly available at Falkners but it is sold A4 and as card blanks if you haven't got the facilities to cut down large sheets. You can also get sample boards from GF Smith if you email them, they are also distributors of Crane's Lettra but don't sell to the general public, I think an email to Paper 2 Go in is order!
There a couple in my list of online suppliers of recycled paper and card, Eco-Craft have a great range, Hairy Manilla (love the name) and Superior range seem to have a bit of give in them so I've ordered some samples to try out! They also sell card blanks and envelopes and have special offers on packs of discontinued stock.
Gemini sell traditional gilt/coloured edged cards, business card blanks, Colorplan, Chromolux and lots of other paper/card/envelopes too numerous to list and also offer a cutting and creasing service, best to download the product list to see the full list of products. This is now under new management and best to ring and check if they offer the same service
UPDATE there is now a link to paper in the supplies list on the right which is frequently updated