A baronetcy becomes Extinct when heirs cannot be traced and are believed not to exist. In this case it would no longer be listed, but would be re-activated should an heir subsequently emerge.
The Royal Warrant of Edward VII of 8th February 1910 states “no person whose name is not entered on the Official Roll shall be received as a Baronet, or shall be addressed or mentioned by that title in any civil or military Commission, Letters Patent or other official document”. Persons wishing to prove succession should read the information given in the Succession Section.
Holders of Baronetcies listed in the attached document (Unclaimed 31 Dec 17) have died, but in each case, up to 31st December 2017, no person has proved succession and thus the Baronetcies are either “Dormant” (Baronet died in 2011 or earlier) or “Vacant” (Baronet died in 2012 or later).