'Jacqueline Hill' is the short form of Ulmus 'Jacqueline Hillier'. It is a fairly common elm cultivar distributed by Hillier in both EU and North America. Discovered by Hillier in a private park, Selly Park, in 1966. It is uncertain which species it is, possibly Ulmus minor, or Ulmus pumila, or the hybrid Ulmus x hollandica which is (Ulmus glabra x Ulmus minor)
Regardless it does not flower or set seed, which is why its provenance is murky. It is winter hardy through zone 5a, possibly colder. has small leaves and because of its dwarf habit is relatively immune to Dutch elm disease.
It is popular for bonsai. You should be able to make a decent tree out of it.