From the longer the Wikipedia page [1].

The Dorset History Centre (formerly Dorset Record Office), founded in 1955) is the archive service for the county of Dorset, England. It collects, stores, preserves and makes available historical documents relating to the history of Dorset. It is a local authority archive service, run by Dorset County Council and jointly funded by Dorset County Council, Bournemouth Borough Council and the Borough of Poole, serving all three authorities. The oldest document in the archives is from 965 AD.

The Dorset History Centre has scored consistently well in The National Archives Self Assessment programme, which evaluates local authority archive services on a number of key indicators. It received a 4* rating in 2010 – the highest rating which can be awarded.

The website is [2]