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Can you please send a link on official source document that there are no requirement to be physically in UK on the day of application (on the day HO receive your application), please?

If I apply using NCS and leave UK on the same day after appointment with NCH? Will it be an issue? Thanks.

There is no document stating this as it is not a requirement to be in the UK.

If you are applying through NCS, then your date of application is your NCS appointment date NOT the date that HO receives the application.