It's disappointing that their organisational skills were so poor. It's just unreasonable to expect people to attend with that much notice.
I am glad I am not the only person to think this was somewhat bizarre!
The golden rule with vetting is "disclose everything". Disclose everything, including the penalty fares and write details of the circumstances. They're looking for integrity and honesty. Putting your hands up and saying you made a mistake in the circumstances you mention are unlikely to go against you. Failing to raise it may do though.
Agreed. I will bear this in mind when I next apply, thanks for the advice.