Prior Copies of Title Documents
The Title Register shows subsisting data only. This means that previous ownerships and mortgages are not shown on the current Register. Because there are many reasons why people would want to look at previous entries the Land Registry have made prior Copies of the register and plan available.
The combination of having a copy of the Prior Title Register and an up to date copy of the Current Title Register is helpful in resolving anomalies and checking that the correct Title has been transferred to you as the new owner.
Prior Copies are only available back to 1986 (or the date of first registration if that is later).