Thanks for the information Natalie. After posting I had done some
researching of conditions with respect to our garden. We're resolved to give
it a go on a sheltered southerly facing slope, with maybe close protection
in winter.
A significant issue is the cost when there is a significant risk of losing
the tree
Regards
David T

Saw one today growing just inside the entrance to the Glasshouse at RHS
Wisley. It is about 8ft tall.

Natalie