MaverickHeath,
there is a very good chance if, acclimated that elm will grow outdoors in England.
Especially near a south wall.
Where they come from in China, is similar the UK in winter temperatures.
As usual test but not on the mother plant - root cuttings normally have the most personality, normal cuttings will also
work or buy a second or third ugly plants.
Try ground growing or tubs in spring. You might get a pleasant surprise.
Seen the site - Bonsai4me ?
Chap is also English.
Good Day
Anthony