These are copies made by one of Soane's pupils in 1795 of a design by Richard Crichton, 1793, for Rossie Castle, Angus for Hercules Ross built c. 1795-1800, demolished 1957.

Richard Crichton (c.1771-1817), son of an Edinburgh mason, had worked as a draughtsman in the Adam office in Edinburgh. Rossie Castle was his first important commission. Colvin (H. Colvin, Biographical dictionary of British architects 1600-1840 , 4th ed., 2008) described him as 'a competent and versatile architect who carried on the traditions established by the brothers Adam in their extensive Scottish practice'; his design for Rossie Castle is clearly in that tradition. Thus Alistair Rowan (op. cit, pp.17-19) wrote (of the Adams) that 'there are no pointed arches, traceried windows, buttresses or pinnacles in any of their castle designs' and the symmetrical 'plans of the Adam castles are clearly linked to normal country house or villa prototypes'. While the inspiration remains 'rooted in the classical world' ... 'the range is impressive, for continental, English and Scottish influences may all be detected within the castle style'.

It is not known whether Crichton and Soane were acquainted (for example, Crichton did not exhibit at the Royal Academy) nor how the drawing came to be copied in Soane's office.