The Treasury shall have power, upon the application from time to time of the Lord Clerk Register, to regulate the number of official searchers of the records, and to grant to such searchers such remuneration out of funds to be provided by Parliament for that purpose as their lordships shall deem fit: Provided that nothing herein contained shall interfere with the right of parties or their agents to employ any other persons to search the records, or shall affect any liability legally attaching to such other persons, or to agents employing them respectively.