* British cyclist bloodied after taking tumble * Arch deflates with one kilometre to go * Yates takes white jersey for best under-25 rider By Julien Pretot LAC DE PAYOLLE, France, July 8 (Reuters) - The seventh stage of the Tour de France ended in farcical fashion on Friday when an inflatable arch, marking 1km to go, deflated and slowed down the bunch, sending Briton Adam Yates to the ground. Yates got back on his bike and crossed the line with blood on his chin, several minutes behind the group of favourites he had attacked earlier. "He was on his own when it happened, the arch fell in front of him and he did not have time to brake so he did a somersault and fell on his face," said Yates' Orica-Bike Exchange sports director Lorenzo Lapage. More...