Children riders rehearse for their big day . One of the features of the Harringay Horse Show , which opens tomorrow , will be the riding and jumping performance by a team of young riders , all of them members of the Crawley and Horsham Pony Club . For some time now the youngsters have been practicing hard under the supervision of Brigadier and Mrs John Allen of Ashington , Sussex , and today they have a rehearsal at Harringay for tomorrow's opening . Photo shows ; Youngest member of the team , 11 year old Gay Tregoning of Ashington , Sussex , riding the youngest pony , " Titwillow " , which was broken-in only last May , photographed arriving for a rehearsal at harringay today . 12 September 1949