There is no requirement and little benefit to registering church land
You must register when property is:
- bought
- gifted
- inherited
- received in exchange for other property or land
- mortgaged
This system was a deliberate choice so that the costs of registration would only be imposed when a transfer of title or other significant event was happening to the property.
However, none of these things ever happen to church property. Or, for that matter, other property that rarely, if ever, changes hands: government property, parks and reserves, railways, ports, airports etc. Currently, this amounts to about 15% of the land in England and Wales (because Scotland and Northern Ireland have their own systems).
Proving ownership the old way
This only comes up, as far as the law is concerned, when there is a dispute over title. Then the issue is solved by testimony and evidence and the person with the more convincing case wins.
The church has kept very good records for an unusually long time, so it’s possible that that they have a title deed and can demonstrate ownership back to time immemorial, 1189.
However, that isn’t actually necessary. If the church (or anyone else) has been in possession of the land unchallenged for 12 years (30 or 60 years for Crown lands), then all they have to do is prove that and the land is theirs. Proving occupancy since 2012 is likely to be easier than proving ownership since 1189.