I have no idea if they meant Maris Otter or Halcyon.
its likely neither. TF makes a Golden Promise style:http://www.northcountrymalt.com/product.php?productid=436&cat=202&page=2I've never used it, but wouldn't hesitate - I have been thoroughly pleased with all of TF offerrings i have tried. Cheers!
I've been using TF Maris otter for almost all my ales and its excellent