If you have a British passport, then you have the right of abode which means you do not need permission to enter/reenter the UK.
If your British passport has expired, then you will need to apply for a new one before travelling to the UK.
As you are a British citizen (you hold citizenship/passport) you do not need to worry about applying for settlement as you have the right to live in the UK without any restrictions.
The Regional Passport Processing Centre website will tell you everything you need to know about applying for a new or replacement British passport from Canada.
Further detailed information on the application process is available here.
I am assuming that you are from Canada as I have read your other questions to get some more background. Please let me know if you are not and I will redirect you to the relevant application process from the country where you are.
I hope that answers your question. Please click accept on my answer and let me know if there is anything else I can help with. Kind regards, Awan Legal.
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