Three nations. Three days. Three triathlons. It’s Game On! Today Jo Whiley and her BBC Radio 2 team of Rev Kate Bottley and Richie Anderson officially begin their epic Sport Relief challenge! The trio take on their first triathlon in Cardiff, starting nearby at Barry Community Water Sports Centre for the freezing cold open water swim section, before cycling a gruelling 30km into the Welsh capital through hilly terrain, finishing at Cardiff Sailing Club. The final leg of the first…