Coat of arms of Margaret Thatcher, The Baroness Thatcher (1925-2013), Prime Minister of the United Kingdom from 1979 to 1990. This achievement was used from 1995 to 2013, granted originally by the College of Arms in 1992 and was designed by the Garter King of Arms Sir Colin Cole. This version displays the circlet of the Order of the Garter to which she was appointed to only in 1995. In this version her shield of arms is in escutcheon form (which is normally only reserved for men), as a result a plain white inescutcheon is placed in the middle of the shield to denote that the shield is her own and not her father's. The shield of arms in the lozenge (as is customary for a woman) is also available.
“

On a shield per chevron azure and gules, a double key in chief between two lions combatant a tower with portcullis in base all or, overall an inescutcheon argent

”
Own work, Based on the heraldic blazon and other works: [1] [2]
Sodacan