MEMBERS of the Lamerton Pony Club had another successful weekend competing at the North Cornwall Pony Club tetrathlon.   Heidi Littlejohns, Katrina Henwood, Josh Steven won their classes and Yasmin Steven came second, as a team they finished third overall. The event is held over two days, with shooting, running and swimming on day one and cross country riding on day two. Yasmin, aged 15, achieved a maximum score on the cross country riding around a testing course at Chyverton Park. Heidi, aged 10, achieved an amazing result in her shooting, scoring a maximum of 1,000 giving her the best shoot, and she also had the best running time in her class. Katrina, 9, had best shoot, run and swim in her age group resulting in both girls winning the triathlon on the first day.