After talking with Brian from Parks at CYC and with the tree supplier at Rogers nurseries this morning, we have, sad to say, decided that it is better not to plant this weekend. We risk too much harm to the trees, and further wintry conditions will mean we can't care for them properly to get good establishment. We will hope to plant towards the end of January/beginning of February, when we have an idea of how conditions are then.
Many thanks for all your enthusiasm for this project - it will happen!
'Til then, keep warm, and enjoy happy festive times.