Growing up in the 70s and 80s (in NE England) my family always had potato croquettes (as well as roasties) on our Xmas dinner, and so did my DH's family (in Yorkshire). We didn't have them at any other time of year, so I'm guessing it must have been inspired by a succesful pre-Xmas advertising campaign when they were a relatively new product. We still have them every year now, so we're passing on the tradition to our kids. Anyone else?