Bounce Theatre are running a story club during lockdown:

Using the power of our imaginations, we take ourselves on wild adventures, become superheroes and save the world!
Join a secret club of story tellers. Each week you will all sorts of art tasks. Along with some special creative challenges. If you send it back to us, we will have it performed by a professional actor and beamed around the world!

They produce attractive PDF downloads with plenty of ideas for writing stories at home.