The Swiss Garden, which features 13 listed pieces, is one of the best-kept examples of a Regency garden in the UK, the Shuttleworth Trust said.
It was first created in the 1820s by Robert Henley, Lord of Ongley, and later restored and developed by the Shuttleworth family.
Bedfordshire County Council leased it in 1976, and it was renovated and reopened to the public in 1981, with Heritage Lottery funding allowing further restoration in 2012.
The Friends of the Swiss Gardens was set up in 1992 to support and raise funds for the site.
The charity decided to begin reinstating statues following the garden’s 200th anniversary in 2024.