O Página de ajuda global do VFS explica o processo em detalhes:
2. Keep Your Passport When Applying
If you need to apply for multiple visas, such as a UK / Schengen combination, or wish to make a short trip while waiting for your UK visa to be processed, you will find the ‘Keep My Passport When Applying’ service at the UK Visa Application Centre very helpful. After enrolling your biometrics and submitting your visa application at the UK visa application centre, if you have opted for this service, your passport is handed back to you.
This is extremely useful if you want to carry on with another country’s visa application formalities, as this service allows you to keep your passport with you.
You can keep your passport with you until the UK embassy makes a decision regarding your visa, one way or the other.
Once the decision is made, you will be called once again to complete the procedures as required by the embassy
O momento da nomeação de retorno depende de quanto tempo leva para os oficiais de imigração tomarem sua decisão e as disponibilidades dessas nomeações. Eventualmente, você terá que voltar ao consulado / embaixada com seu passaporte original para que o visto / carimbo seja aplicado.