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 pair of Bow butter-dishes and covers with cherry-spray finials
Maker:  Maker Unknown
Description: 
A pair of Bow butter-dishes and covers with cherry-spray finials, painted in colours with flower-sprays (bases cracked, one finial lacking), 4 3/4in. wide.
ID:  119288
Currently kept at: Althorp