Bookplate showing the arms of the Earls of Tankerville (third creation): Gules, a bezant between three demi lions rampant argent. Crest – A double scaling ladder or. Another crest – Out of a mural crown or, a lion's head gules on the neck a bezant. Supporters – Two lions argent ducally crowned or, each charged on the shoulder with a torteau. Motto – De bon vouloir servir le roy. 
The Earl of Tankerville holds the subsidiary title of Baron Ossulston, of Ossulston in the County of Middlesex (1682), in the Peerage of England. The present Earl lives in West London and North Yorkshire.