I am a UK citizen, when my passport is due for renewal would I still be able to do 90 day report whilst it is being changed? I don't know if British Embassy keeps the original until I get a new one.
TLDR : Answer Summary
A UK citizen can complete their 90-day report while their passport is being renewed. When renewing through VFS Global, the old passport can be retained until the new one is collected. Although the British Embassy requires the old passport, you should still be able to conduct necessary immigration tasks during this period.