Q.Do Japanese Umbrella trees survive Scottish winters with temps down to minus 10/11C?
Have not bought the tree yet. Need more info first.

Certified GKH Gardening Expert
They will survive much lower than this... The problem comes with the heat. They can only survive to our zone 8a and below. This will mean that it will prefer cooler temperatures than what your zone has to offer. This does not mean that it will not survive there, but it will mean that it will need special protection from the heat, and full sun. It may not live near as long either.
I would highly recommend something for a warmer climate, but I will include a link to their care while the idea is mulled over: https://www.gardeningknowhow.com/ornamental/trees/umbrella-pine/umbrella-pine-planting.htm