The worms you need for composting are types of earthworms but are often referred to as surface litter worms: These include Eisenia Foetida (Tiger Worms), Eisenia Andrei or, Eisenia Hortensis (often known as a Dendrabaena Veneta) They are all a reddy-brown-ish colour and they live in the soil in the surface layer of decaying vegetation. You will find them naturally on the floor of a forest or they often migrate into your compost heap. They are all UK native species of Earthworms.
For more help with Worm Composting please visit our Wiggly Wizard knowledge base here https://wiggly-wigglers-faq.malcolm.app/
Or if you want more info about purchasing a wormery or starting worm composting please pop on over to https://www.wigglywigglers.co.uk/collections/worm-composting