My job? I can't see me speeding or, if I did, lying about it, frankly. I'd probably just pay the fine as would most people. My husband was fined for speeding some years ago, he was fed up about it as he was only a little over the speed limit but it was out in the country where the traffic police are a lot hotter on speeding.
I'd keep my job, probably get some sympathy from colleagues too.
I honestly cannot understand why Fiona Onasanya lied! I can only assume she panicked. Reading up on it (& there seem to be two cases), she might have been confused about the dates on which she was driving. She's still protesting her innocence.
If she is kicked out I hope it won't be forever.