Board of Ordnance
Felbrigg, Norfolk
Ordnance Survey (England, Scotland, Wales)
Baddesley Clinton, Warwickshire
Chastleton House, Oxfordshire
Geological Survey of Great Britain
Bateman's, East Sussex
Shaw's Corner, Hertfordshire
Hanbury Hall, Worcestershire
Tyntesfield, North Somerset
T. L. Murray
Stourhead, Wiltshire
Owletts, Kent
Lacock, Wiltshire
Nuffield Place, Oxfordshire
Coleton Fishacre, Devon
Dunham Massey, Cheshire
Sissinghurst Castle Garden, Kent
Scotney Castle, Kent
Attingham Park, Shropshire
Gunby Hall Estate, Lincolnshire
Cragside, Northumberland
Calke Abbey, Derbyshire