you might have a problem.
I have a friend that lives north of where i live and he actually planted his palm where it freezes, he just covers it with a blanket and sprays it down twice a day with water. he said he's had the palm for years using that method...
Hybrids do well in the U.K. The mule palm is doing great over there. As well as a few other hybrids. We just shipped 100 mule palms to the U.K. last month.