Erddig, Wrexham (Accredited Museum)
Greenway, Devon (Accredited Museum)
Cliveden Estate, Buckinghamshire
Kingston Lacy Estate, Dorset (Accredited Museum)
Belton House, Lincolnshire (Accredited Museum)
Llanerchaeron, Ceredigion (Accredited Museum)
Wimpole, Cambridgeshire (Accredited Museum)
Anglesey Abbey, Cambridgeshire (Accredited Museum)
Cornish Engines, Cornwall
Snowshill Manor and Garden, Gloucestershire (Accredited Museum)
Greyfriars, Worcestershire (Accredited Museum)
Sutton Hoo, Suffolk
Mount Stewart, County Down (Accredited Museum)
Standen House and Garden, West Sussex (Accredited Museum)
Knightshayes Court, Devon (Accredited Museum)
Ickworth, Suffolk (Accredited Museum)
Beatrix Potter Gallery, Cumbria (Accredited Museum)
Tyntesfield, North Somerset
Greys Court, Oxfordshire (Accredited Museum)
Ormesby Hall, Redcar and Cleveland (Accredited Museum)
Perry and Co.
Florence Court, County Fermanagh (Accredited Museum)
Nuffield Place, Oxfordshire (Accredited Museum)
Nymans Estate, West Sussex (Accredited Museum)
S. Mordan and Co.
Hardwick Hall, Derbyshire (Accredited Museum)
Tredegar, Newport (Accredited Museum)
Shaw's Corner, Hertfordshire (Accredited Museum)
Stourhead, Wiltshire (Accredited Museum)
National Trust Museum of Childhood (Accredited Museum)
Buscot and Coleshill Estates, Oxfordshire
Calke Abbey, Derbyshire (Accredited Museum)
Alpco
Pneumo
Eagle Pencil Co..
A. W. Faber
American Pencil Co.
PCO Pencils Ltd