Going by memory here from a lunch in November 2016. Haddock n Chips had a serious but light crunch coating, generous portion. The fries were meaty and brown and abundant. Also they had Innis and Gunn beer which is hard to find. Friendly service, and the atmosphere was clean.
While I still think the best fish n chips is way over in St. John's Newfoundland, but that would be six stars, and Newmarket is, well, closer.