These are historical "titles of property" rather than nobility. Titles - GOV.UK
However, there are three legal ways to "buy" the style or social use of the title : 1. Lordship of the Manor (Manorial Titles) buy a lady title uk
In the UK, you (such as a Peerage) that grants a seat in the House of Lords or formal recognition by the Crown. Under the Honours (Prevention of Abuses) Act 1925 , selling such honours is a criminal offense. These are historical "titles of property" rather than