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What the fixed period for the title to freehold land then?
As for leaseholds, a lease can either be a fixed term tenancy (technically 'a term of years') or it can be a periodic tenancy which automatically renews until terminated by a notice to quit, so a leasehold interest doesn't necessarily have a fixed period either, including a statutory periodic tenancy which comes into existence on the expiry of an assured tenancy.
So, what's this fixed period?
No, it doesn't. It means you have property rights for a fixed period, which is not the same thing.