The Hon is a matter of courtesy and accorded to children born prior to
their parents marriage, upon the marriage of the parents, it is non
hereditary, see the Barony of St Leonards, Wardington, Halberton for
further examples. The Bolingbroke peerages may eventually end up
merging with those of the earldom of Orkney, as apart from the issue
of the late Viscount, there is Walter Warren, b 1921, who has an only
son, b 1950, who has an unmarried son b German Andres b 1980.