Milford Haven Refinery is a really big place where they make things called fuels that are used to power cars and other machines. Just like how a bakery makes yummy cakes, Milford Haven Refinery makes fuel that is important for our cars and buses to work.
The refinery is located in a town called Milford Haven in Wales and it's like a factory that has lots of rooms where workers do different jobs to make the fuel. There are special pipes that carry different ingredients called crude oil and gases into the factory. Then, machines inside the factory heat up the crude oil and gases, and separate them into different parts. They take the parts that will be useful and keep them separate from the ones they don't need.
After the machines have done their job, workers check the fuel to make sure it is good quality and safe to use. Then they put it in big tanks which trucks and ships will come to get so they can deliver it to gas stations and other places that need fuel.
So, when you go on a road trip with your family or take a bus to school, you can remember that Milford Haven Refinery is one of the places that made it possible.