Winter only roof for my pergola
I have spent most of the summer putting up a pergola in my garden which is attached to my shed at the bottom of the garden. Knowing our weather, for the winter I would like to protect it with a clear roof of some sort and most probably remove the same next summer. This would allow me to do jobs outside without getting wet. I do not like the roofing plastic used for conservatories, and ideally I would like a clear view of the sky. I don't have tons of money to spend so any ideas please!