Haha yeah I've done just about every version of fucking up a TT you can do.
Missed my start by minutes but filled a position down the line and done the flying start through the starters. I think it was on an F course. Can't really remember the race or result but I think it was north London.
It actually worked out in my favour tbh, I got to the line only about 2 seconds late, but had a 25mph running start as the TK waved me through!
Definitely felt the effort 5mi later though..