Cliveden Estate, Buckinghamshire
Belton House, Lincolnshire (Accredited Museum)
Gents
Beningbrough Hall, North Yorkshire (Accredited Museum)
Berrington Hall, Herefordshire (Accredited Museum)
Patterson and Sons
Castle Ward, County Down (Accredited Museum)
Chirk Castle, Wrexham (Accredited Museum)
Julius Sax
Clandon Park, Surrey
Florence Court, County Fermanagh (Accredited Museum)
Hardwick Hall, Derbyshire (Accredited Museum)
Ightham Mote, Kent (Accredited Museum)
Sunnycroft, Shropshire (Accredited Museum)
Treasurer's House, North Yorkshire (Accredited Museum)
Uppark House and Garden, West Sussex (Accredited Museum)
Bateman's, East Sussex (Accredited Museum)
Baddesley Clinton, Warwickshire (Accredited Museum)
Nostell Priory, West Yorkshire (Accredited Museum)
Ormesby Hall, Redcar and Cleveland (Accredited Museum)
Powis Castle and Garden, Powys (Accredited Museum)
Shaw's Corner, Hertfordshire (Accredited Museum)
Souter and the Leas, Tyne and Wear (Accredited Museum)
Coughton Court, Warwickshire
Tyntesfield, North Somerset
Hatchlands Park, Surrey (Accredited Museum)
Killerton, Devon (Accredited Museum)
Charles Letts and Co.
Drake and Gorham Ltd
Dunham Massey, Cheshire (Accredited Museum)
Stoneacre, Kent
Coleton Fishacre, Devon (Accredited Museum)
Leo Sunderland and Co.
Mount Stewart, County Down (Accredited Museum)
Walker Bros [Electrical Engineers]
Packwood House, Warwickshire (Accredited Museum)
Penrhyn Castle, Gwynedd (Accredited Museum)
Higgins & Griffith Ltd.
Polesden Lacey, Surrey (Accredited Museum)
R. Hadwin and Sons & Colin Croft
Sizergh Castle, Cumbria
Osterley Park and House, London (Accredited Museum)
