Imagine you are building a bed to sleep on. The part of the bed that you sleep on is called a mattress. Some people like their mattress hard and some people like their mattress soft. One type of mattress that lots of people like is made from wool.
Wool is a soft, fuzzy material that comes from sheep. People shave off the sheep's hair, and then use a special machine to turn it into wool. This wool is then made into a mattress called a Woolwich bed.
But there's a special type of Woolwich bed called the Reading bed. This bed has both soft wool and harder materials like horsehair and cotton mixed together inside the mattress. This makes the bed really comfortable and helps people sleep better.
So, the difference between a Woolwich bed and a Reading bed is that a Woolwich bed is made only from soft wool, while a Reading bed is made from a mixture of softer wool and harder materials like horsehair and cotton for extra comfort.