I think you're probably too late. Check out T&M website below as they give you planting time for each potato cropping group.
http://potatoes.thompson-morgan.com/growing-potatoes
As you can see, the earliest show from Feb onwards. I also want to grow potato next year so I'm only learning, no experience as yet to speak of!!!
I think T&M is useful guide but once you've decided which potato you want to grow, I found that alanromans.com does pototoes at a cheaper price although some fancier potatoes (like Mayan Gold & Vivaldi) you won't find there. Apparently Alan Romans is a potato consultant to T&M and he has written is own book on potato. Happy potato growing next year.