The chimneypiece is designed in the George III Roman fashion popularised by the court architect Robert Adam (d.1792). The antique fluted frieze displays a central tablet of a veil-draped and laurel festooned sacred urn, while the pilasters are embellished with palm-flowered arabesques.
The ornamentation of chimneypieces with both pewter and gesso ornament is prevalent from the 1770's. The metalic surface was meant to be painted to merge with the background. One of the principle exponents of the manufacture of pewter ornament was the Soho works of Matthew Boulton and John Fothergill.
Alison Kelly The Book of English Fireplaces, London, 1968, pp.62-63. Sir Nicholas Goodison Matthew Boulton: Ormolu, London, 2002, pp.191-192.