Excepting the motte on which it stood, and a small section of curtain wall there is little left of the structure of what was once a very powerful castle of enceinte.

From the Countess Margaret's death in 1417 Bunkle passed to her son George Douglas, 1st Earl of Angus, with whose descendants it remained until the late 18th century.

[4] Bunkle subsequently belonged to Margaret Tudor as Countess of Angus, and was held by George Douglas of Pittendreich, who had been Bailie of Bonkill since 1514.

[6] In August 1523 the Earl of Surrey suggested that if Margaret Tudor came to Bunkle with her silver plate and jewels, pretending to intercede for the people of the Scottish borders, he could convey her safely to England.

A popular Berwickshire rhyme refers to the medieval strengths of Bonkyll and the nearby fortresses of Billie Castle, and Blanerne Castle referring to their construction in the time of David I and to their sad ultimate fates as piles of rubble, an allegory to the effective extinction of the Kingdom of Scotland after the formation of Great Britain in 1707: Bunkle, Billie and Blanerne Three castles strong as airn Built when Davie was a bairn They'll all gang doon, Wi' Scotland's Croon And ilka ane shall be a cairn