found: London and Westminster improved, illustrated by plans, 1766:t.p. (John Gwynn)
found: DNB(Gwynn, Gwyn, or Gwynne, John, d. 1786; architect)
found: Oxford DNB online, 20 Dec. 2013(Gwynn [Gwyn, Gwynne], John (bap. 1713, d. 1786), architect; born in Shrewsbury; baptised 12 November 1713 at St Julian's Church, Shrewsbury; died 27 February 1786 in Worcester)
found: Skempton, A. Biographical dictionary of civil engineers. Vol. 1: 1500-1830, 2002(Gwynn, John (1713-1786); writer, architect and bridge-builder; a native of Shrewsbury; his most important book was "London and Westminster improved")
found: Wikipedia, 20 Dec. 2013(John Gwynn (1713-28 February 1786) was an English architect and civil engineer, who became one of the founder members of the Royal Academy in 1768; he advocated greater control over planning in London, for which he produced detailed suggestions; his buildings include Magdalen Bridge and the Covered Market in Oxford, and several bridges over the River Severn; he was born and died in Shrewsbury; he worked initially as a carpenter, but then decided to practice as a (largely self-taught) architect and town planner, moving to London, where he became a friend of Samuel) Johnson)