Avonvalley Jolly Roger joins us on lease Published 14th April 2016 | By Dafydd Hughes Avonvalley Jolly Roger Avonvalley Jolly Roger (Avonvalley Union Jack x Rumbush Princess by Geler Brenin ap Dafydd) has joined us on lease by kind permission of John Llewelyn James and Ann Thompson of the Avonvalley stud.