Citizenship applications can take up to 6 months, sometimes longer. There is additional waiting for the the ceremony.
You only become officially British on the day of the ceremony, not when you get your decision letter.
A pending citizenship application or a letter stating your application has been successful do not prove your status in the UK.
If you applied for citizenship with a PR card, these will no longer prove your status in the UK and you will need to apply for settled status.
You can still use the PR card number to apply for settled status, as noted here: Applying with PR
You need to apply for settled status before the end of June 2021.
If you applied for citizenship with ILR, you don't need to apply for settled status as it is also ILR.
See: Check if you can become a British citizen - GOV.UK
Staying in the UK after 30 June 2021 if you’re an EU, EEA or Swiss citizen
You must apply for permission to continue living in the UK after 30 June 2021.
If you have not been granted citizenship and had a citizenship ceremony, apply to the EU Settlement Scheme to continue living in the UK after 30 June 2021.
Citizenship applications usually take around 6 months to process and may take longer. You cannot stay in the UK after 30 June 2021 while you wait for citizenship, unless you have permission to stay here in another way. For example, if you have settled or pre-settled status under the EU Settlement Scheme.
You must apply for permission to continue living in the UK after 30 June 2021.
If you have not been granted citizenship and had a citizenship ceremony, apply to the EU Settlement Scheme to continue living in the UK after 30 June 2021.
Citizenship applications usually take around 6 months to process and may take longer. You cannot stay in the UK after 30 June 2021 while you wait for citizenship, unless you have permission to stay here in another way. For example, if you have settled or pre-settled status under the EU Settlement Scheme.
