Thank you so much, Catherine & Co.!
The tree arrived this afternoon along with the rhubarb. It was so well-packed that it took me almost an hour to unravel all the tape, bubblewrap and such. The tree looks great. It has had some compost put around its roots in a breathable bag for this evening and the rhubarb root planted in a pot; I won't plant that out until Spring is around the corner. I find they don't like sitting in cold, damp soil over the Winter when establishing.
Thank you again for all your kind help and valued advice. I certainly know where to come next time!Ruth