Identify this potato?

This is the last of these lovely potatoes, and I'd love to grow them again...but I can't remember what they are! They are yellow, waxy, with a buttery taste. They grew to a medium size, no large ones for baking and I've kept them well in a paper sack in the garage. Can anyone look at the photo attached and help me remember what they are, please? The piece of paper is pure white and the matchstick is for scale.
Jackie.

Could be Nicola or Yukon Gold