The Much Honoured

The Much Honoured (abbreviated to The Much Hon.) is an honorific that is bestowed on members of Scotland's feudal nobility, which comes within the jurisdiction of the Court of the Lord Lyon in Edinburgh. 
This includes Scottish feudal barons, who generally bear titles granted before the 1707 Act of Union created within the ancient baronage of Scotland. 
In addition, there are seven feudal earldoms (Arran, Breadalbane, Crawfurd-Lindsay, Errol, Nithsdale, Rothes, Wigtown), one feudal marquessate (Huntly) and one feudal dukedom (Hamilton), all held "in baroneum", where there is entitlement. Of these, four of the earldoms are extant, two are unclaimed, one is in dispute and the dukedom and marquessate are held by senior members of the Scottish peerage.
By tradition, certain territorial lairds were permitted to style themselves "The Much Honoured", this practice was considered archaic although has been re-introduced by Lairds registered in the Public Register of all Arms and Bearings in Scotland. 
There is a convention that
title holders resident outside Scotland may style themselves “The Much Honoured” when they are "outwith the Realm of Scotland". However, north of the border, the honorific is normally dropped in favour of the traditional territorial designation. It is thought this convention may have its origins in the regularisation of titles of nobility that took place after the publication of "The New Peerage" by John Debrett in 1769. 
The highest-ranking feudal baron in Scotland is The Much Hon. The Baron of Renfrew, His Royal Highness The Duke of Rothesay; by tradition both titles being held concurrently by the heir apparent to the British throne.
The Marquess of Huntly and The Earl of Eglinton and Winton are other notable holders of feudal titles.
Entitlement.
There are three classes of entitlement:
The use of this entitlement was re-introduced by some Scottish Lairds holding Armorial Bearings within the Public Register of All Arms and Bearings in Scotland.
Online purchase of a Lairdship title - with or without a tiny patch of Scottish land - does not entitle the purchaser to claim entitlement of "Lairdship" within the Court of Lord Lyon, or indeed to use "The Much Honoured" style of address.
Online purchase of "Laird of the Souvenir Plot" is a "fantasy title" that should not be confused with anything else. The online purchase of an ancient title is classified again as a fantasist holder of nobility. The Home Office have a publication called Titles that indicate how to add, record and make observations on passports regarding entitlement. 
The eldest son of a Scots baron is entitled to be addressed by courtesy as "the Younger" (abbreviated to "the Yr"); the eldest daughter of a Scots baron, if heir apparent, is entitled to use the courtesy title "The Maid of [name of barony]" (e.g. "David Leslie the Younger" and "The Maid of Leslie").
The honorific "The Much Honoured" should not be confused with those attaching to peers of the Realm: