The LRA 2002 is based on Law Commission Report No 271, Land Registration for the Twenty-First Century: A Conveyancing Revolution (2001). A full copy of the Report is accessible from the Law Commission:

http://www.lawcom.gov.uk/project/land-registration-for-the-21st-century/#land-registration-for-the-twenty-first-century

The final report was preceded by Law Commission Report No 254, Land Registration for the Twenty-First Century: A Consultative Document (1998). The full text is accessible from the Law Commission:

http://www.lawcom.gov.uk/project/land-registration-for-the-21st-century/#land-registration-for-the-twenty-first-century

Note that Law Commission Consultation Paper No 227, Updating the Land Registration Act 2002 was produced in 2016, and is discussed in Chapter 18. That 2016 Consultation Paper then led to Law Commission Report No 280, Updating the Land Registration Act 2002 (2018): it was published in July, after the 4th edition of the book was written. The full text of each of the 2016 Consultation Paper and the 2018 Report are available at:

https://www.lawcom.gov.uk/project/updating-the-land-registration-act-2002/#updating-the-land-registration-act-2002

The official site of Land Registry contains up to date information on land registration, including e-conveyancing:

http://www.landregistry.gov.uk/