justanothermile
Bloody hell a question on an Oxbridge thread I can answer.
If your DD takes the offer which becomes unconditional when firmed, that's it. You don't need or put an insurance choice. You are in, well your DD is. Ds did this with Lincoln. So he just firmed Lincoln, we did check with Lincoln on his offers day, and with a kind lady at UCAS too.
That's it, Lincoln even rang 7 days before A level results day to confirm his place, gave him their congratulations and backed it up in an email.
Be careful though, because once you confirm your unconditional, you are going there, so unable to go through clearing or adjustment processes, so if you DD changes her mind, I believe, she has to withdraw from this year and take a gap year to reapply in 2020.
hope that answers your query.
Good luck to your DD. I am sure she will succeed where ever she chooses to go, and they will be glad to have such a talented student.