Best I had in the UK was at the Magpie back in 2010. Our best friends on extended vacation in the UK went to 149 in Bridlington on our recommendation the year after they won and were really impressed. We also recommended that they try the Magpie when they later visited Whitby but the queue was long and went to a nearby restaurant instead. Said it was excellent and believe it was Trenchers.
Trenchers is a bit of a walk from Magpie. There are quite a few fish and chips shops closer. If you or any friends are over again I would try Hadley’s in Whitby and North Beach Cafe in Brid. 149 is still good but they have been overtaken by North Bay in my opinion although they are dearer than 149.