No Time Limit Stamp
What is a No Time Limit Stamp?
A no time limit stamp falls under the same category as a Biometric Residence Permit. This visa enables you to transfer a visa from an old passport to a new one. If you do not have a BRP card and have a visa on your passport then you can apply under this category to transfer the same to a BRP card, however if you hold Indefinite Leave to Remain the you should apply for No Time Limit Stamp.
You are still able to use your visa even if your passport’s expired. However, you can choose to replace it with a biometric residence permit (BRP) if you’re in the UK.
You must replace your visa with a BRP if the following happens:
Your name or personal details change.
Your passport has expired
You can still use the valid visa in your expired passport, but you’ll need to show your expired passport and your new passport when you’re travelling to and from the UK.
You should apply for a BRP if your overall stay in the UK is longer than 6 months and if any of these details on your visa document change:
date of birth
You don’t need to report any changes or get a BRP if your stay in the UK is less than 6 months.