Do you have a photo of this damage to the helmet?
Cant find a photo, but a few words from the man himself (and Cycling Weekly's confirmation that the helmet was indeed damaged) should suffice...
“I feel alright. I head butted the wooden pole thing. Luckily, there was a barrier, which stopped me falling. I was all tangled up in the bushes and wire. Some guy pulled me up and I was all right. Some French people like us!”
Thomas’s helmet showed the scrapes of the dangerous head collision, but his humour proved he was still the same cyclist who helped Froome win the 2013 Tour.