It looks like we will be getting a taste of winter over the next two weeks. It will certainly make a change from the constant rain we have been experiencing, but will bring it own challenges.
It may be wise to think about protecting your trees from severe frost and cold wind. With soil frozen in the pots, the rots will not be able to replace moisture lost from branches due to wind desication and may lead to dieback of small branches. Especially the more tender species such as Chinese Elm, Azaleas and Trident maples and should be brought into a shed or cold greenhouse to shelter them from the worst of the weather. Alternatively, move them close to a house wall and cover with horticultural fleece.