You will need to contact the owner's representative to arrange access.
In the case of this object this can be done by:
Writing to Nigel Shields at The Estate Office, Althorp, Northampton, Northamptonshire, Nn7 4hq
Emailing Nigel Shields:
Reporting A Data Error:
Reporting An Access Error to the HMRC:
A George III bronze mantel clock
Maker:  Joseph Boschi
A George III bronze mantel clock, the movement by Richard Best, London, with circular white enamel dial in pedestal case with three seated and standing classical figures, on porphyry plinth with ormolu borders and lions' paw feet, signed Joseph Boschi, Romae 1797, 13 3/4in. high.
Currently kept at: Althorp
THIS ARTWORK IS LOCATED IN:Northamptonshire
As per Althorp website. At other times by appointment through the contact point.