Steeped grain plus malt extract:
Newcastle Brown Ale is a well-known example of a British brown ale.
The recipe recommends Witbread ale strains from Wyeast (1099) or White Labs (WLP017). Dry yeast possibilities are Mangrove Jack Empire Ale or Fermentis S-04.
The Brew Your Own Big Book of Clone Recipes (2018), p. 85, Quarto Publishing Group