A business owner is facing jail after four children shattered their legs at his American-themed trampoline park.Philip Booth, 60, failed to tell power when a boy and girl, both aged three and two girls, aged nine and 11, were hurt at his park.A court heard they suffered wounds while jumping on trampolines and into foam pits at Supajump in Cardiff Bay, Wales.The park boasts 20,000 marketplace feet...