You sent me down a wikipedia rabbit hole. Technically it is THE Metro. The precursor to the Underground was the Metropolitan Railway and the Underground still uses a lot of the old stations. All other metros are named after the Metropolitan Railway, which was the first of it’s kind.
Bottom to top: Chips/fries Gravy Peas Sausage, but not like any of the ones you mentioned. They are very common here in uk fish and chip shops.
If i was stumbling home drunk at 3am this would be heavenly. I would not eat it at any other time.