Did the Queen break Royal protocol to criticise Margaret Thatcher?

On the latest Queens, Kings and Dastardly Things podcast, royal biographers Robert Hardman and Andrew Morton debate the late Queen's relationships with her 15 Prime Ministers. From Winston Churchill to Liz Truss , the historians assess the impact individual leaders had on her 70-year reign. They highlight Margaret Thatcher as having a particularly trying relationship with the Queen, despite both women being close in age and attempting to leave their mark on the male dominated halls of British power.