A number of elements in the design of these brackets suggest that they are a very sophisticated Regency addition for a Palladian room. This theory is supported by the provenance; several of the rooms in the south front at Raby retain substantial elements of Paine's Palladian scheme. It is tempting to speculate that these brackets were supplied for the Drawing Room, now the South Drawing Room, which is known to have been re-furnished in the Regency period (cf., primarily, lots 224 and 225 in this sale). The trefoil tops hint at the Gothic, although accompanied by the Palladian egg-and-dart. It is the fruiting bases which seem most Regency in style.
A softwood bracket of a very similar model and from the collection of the late Mr. F.C. Harper is illustrated in R. Edwards and P. Macquoid, The Dictionary of English Furniture, rev. ed., London, 1954, vol. I, p. 117, fig. 4. Another similar pair in the hall at Edgcote, Northamptonshire, are illustrated ibid., p. 13, fig. 19