My parents are planning to visit me in the UK through Family Visitor visa route (I am a naturalised British Citizen).
I am doing the applications on behalf of them and I managed to forget declaring my dad's recent tourist visit to Nepal.

Can anyone please advise if:
- Including a covering note along with the application on the appointment day informing them about the mistake will be sufficient?
- I have to cancel the appointment and re-apply for my dad?
- any other options?
Thanks!
