Name Change Deed Poll Lost

I require assistance in retrieving documentation pertaining to a name change done in 2001. In that year, I underwent a legal name change process using a deed poll. Unfortunately, I do not have a copy of that original deed poll as it was handled by a friend who has since passed away. More recently, in 2007, I changed my name back via another deed poll which I do have in my possession. I am now in need of both name change documents as proof for an application to the Transport for London licensing authority wherein they require evidence of all prior legal name alterations. Given the unavailability of the original 2001 deed poll, could you please investigate options for obtaining a replacement through official records searches or other lawful means? Due diligence will be needed to validate the prior name change event and confirm authentic details matching public records from that time period. Your expertise in navigating legal documentation matters would be greatly valued. I seek your advice and help on the best approach. Proper name change verification for my application is important so clarity on this historic record retrieval is needed. Thank you in advance for any guidance or assistance you could offer.