Analysis of information sources in references of the Wikipedia article "Courtesy titles in the United Kingdom" in English language version.
If a marriage between a duke and a duchess has been dissolved, the former wife (although no longer a peeress) may continue to use her title as a duke's wife, preceded by her forename (unless she remarries)
The correct style and description of divorced ladies who have not remarried nor have taken steps to resume their maiden name with the prefix of Mrs, is as follows: The former wife of a Peer or courtesy Peer,——Mary, Viscountess——
if she remarries, she would take the style of her subsequent husband...if Tessa, Viscountess Tilney, marries Mr George Robinson she becomes Mrs George Robinson
The Scottish title "Laird" is a courtesy title with no legal status...in reality, certain long-established estates have the title attached to them...
The widow of a chief or laird continues to use the territorial style and the prefix Dowager may be used in the same circumstances ... In rural Scotland (laird's) wives are often styled Lady, though not legally except in the case of the wives of chiefs.
The heirs of chiefs, chieftains and lairds are addressed in writing with the distinction "the younger" before or after the territorial designation...all unmarried daughters use the (territorial) title...It is not the custom for younger sons of a chief, chieftain or laird to use either the "Younger" or the territorial titles
The use of the prefix "The Much Hon." for barons and chiefs is correct, but used only in the most formal circumstances. "Esq." is not required, and "Mr." is incorrect. Most barons and lairds of old Scottish families prefer the unadorned name and territorial designation – Ian Shand of Pitscot – similar to the "de" or "von" of Continental families...
