Here is an excerpt from Fox-Davies "Armorial Families", 1930 version.
Leir of Ditcheat
Leir of Ditcheat (H. Coll., 18 Jan. 1913). Azure, a fesse flory counterflory between three unicorns' heads erased or. Mantling azure and or. Crest-- On a wreath of the colours, a demi-unicorn, supporting between the legs a sceptre erect, all gold. Motto--"Le Lierrelie longs liens." Son of Rev. William Marriott Leir, M.A., of Ditcheat, b. 1805; d. 1891; m. 1840, Mary Ann, only d. of Edward Langford:-- Major-Gen. Richard Langford Leir-Carleton (q.v.). Sons of Rev. Charles Edward Leir, M.A., Rectorof Ditcheat, b. 1842; d. 1924; m. 1871, Frances Mary, eld. d of Rev Thomas Fox