Benjamin - many thanks. That title/property was first registered in 2006 so we don't have an earlier edition re the years you are searching for
The original deeds/documents would have been returned to the conveyancer acting for that first registered owner. so one option is to contact the current owner to see if they now have those deeds/documents. Probable that they won't as it's not routine to hand them over when a property is sold.
Or you can apply by post for a copy of the list of documents submitted at the time of first registration in 2006. That's a form DL submitted with FR on 22 Dec 2006 -
Get information about property and land: Get a copy of the deeds - GOV.UK
The list should include details of the older deeds/documents inc dates and parties involved and therefore cover at least 15 years prior to 2006 albeit in minimal detail
HP681889