The UK border and immigration system is switching to digital. Physical documents including Biometric Residence Permits (BRPs) are being replaced by an online record of your immigration status; this is known as an eVisa and is accessed via a UK Visas and Immigration (UKVI) account.
Your eVisa will be used to confirm your right to travel to the UK if you travel internationally. You should check your current passport or travel document is linked to your eVisa before you travel.
If you manage the UKVI account of any family members you should also check that their current passport or travel document is linked to their eVisa before travel. You can check the travel document linked to your eVisa and update it if required at https://www.gov.uk/update-uk-visas-immigration-account-details/update-your-ukvi-account.
You need to update your passport or travel document information every time it changes to avoid travel delays.
While carriers, including airlines, should be able to check your eVisa automatically, you may still be asked to show evidence of your immigration status as we transition to eVisas. You may therefore find it helpful to create a Share Code in advance of travel and carry it with you. You can then print, write down or otherwise store it to be able to provide it when needed. A Share Code is valid for 90 days so can be created in advance of travel. You can find more information about this at https://www.gov.uk/view-prove-immigration-status. If you manage the UKVI account of any family members you will be able to generate a share code for them as well