I found a store in missouri that sells heirloom seeds. They have some pansies, but not miss mott. Their website is rareseeds.com. Check it out, hope it helps!!!

Sarah
P.S. If you just go to google and type in "Heirloom Seeds" it should bring you a bunch of websites!

I know this reply is a few years out of date, but I followed a link and found the query here, and coincidentally just tonight came across a website for a nursery in the US which sells a lot of named violas, Sequim.com, pronounced, they tell us, Squim.com. It's the first one I've seen that sells these violas, and I know people who have been seeking them for some time. They are much easier to find in the UK . I hope this helps someone.

Marguerite, thanks for the info. This link takes you right to Maggie Mott

http://www.sequimrareplants.com/Viola%20'Maggie%20Mott'.html