Haggis (Microvis sp.) evolved from highland Celtic Pygmy Sheep.
The Oggy (indigenous to Cornwall, Devon and Somerset) resembles a large hedgehog.
Wurzels (West Country) and Neeps (Scotland) are arboreal relatives of rabbits.
Welsh Rarebits are an increasingly rare hybrid between a hare and a rabbit.
The traditional dish of Toad-in-the-Hole, Greater Striated Warbling Toad near extinction.
Hot dogs in the UK are made from weasel-like amphibious canines hunted in the East Anglian fen.
To read more about these endangered species go here