I read that the first Senior TT was only held in 1911, the first year of The Mountain Circuit, I'll do more homework on that! Also, this was the 96th event, but has The Senior been run at every event? I think the cancellation in 2012 was the first time it hadn't been run. So it seems there could be two or three potential Centenaries - 100th actual TT in 2019. 100th Senior TT in 2020 and 100th Mountain Course TT in 2023. At least three parties to gear up for, hope the Steam Packet are planning ahead!!