Looking at your previous posts, I understand you have lived in the UK for 27 years, hold ILR and have recently received an NTL BRP?
- If so, as long as you do not leave the UK for more than 2 years, you are fine.
- However, if you leave to live somewhere else and do not return to live in the UK for more than 2 years, your ILR will lapse and you will have to start over from scratch with the visa process in order to move back to the UK.
If you want to be completely free of immigration restrictions, I would recommend applying for UK citizenship, as that means you can leave and re-enter the UK whenever you like without needing to worry about immigration. Also, if you apply for citizenship, you won't have to renew your BRP, because it will have been replaced with a UK passport.
Unfortunately, UK citizenship prices have risen drastically over the last few years and it currently costs £1282 to naturalise... whereas back in 2003, it was only £150.