I'll be upfront about this: I am dedicated Republican. In the UK, this means that I am opposed to the monarchy, and am a member of a campaign to have of Head of State democratically elected rather than chosen by the lottery of birth. As a Republican, I am often critical of the monarchy, and on occasion, of the Queen herself.
However, even I would balk at calling her a bare-faced liar. Prominent creationists, among them Ken Ham of Answers in Genesis, and Stephen Green of Christian Voice UK, have no such qualms.
As Head of State of an officially non-secular state, the Queen is also the Head of the Church of England (the actual title is Supreme Governor of the Church of England. The Church of England officially accepts that evolution is true, and by extension, the Queen also must officially accept that evolution is true. Thus, when creationists claim that evolution is a lie, not only are they calling the CofE a bunch of liars, they are saying that the Queen herself accepts and encourages the lie.
(Note: I have no idea whether the Queen even knows what evolution actually means, nor whether she personally supports the idea. But as Supreme Governor of the Church of England, in her official capacity, she certainly endorses it).
Ironically, Stephen Green is pro-monarchy, and a loyal supporter of the Queen. Yep, the same queen who he is calling a liar. That, Mr Green, is a treasonous accusation. The Tower awaits.