Just remember these...
Boudicca good, Suetonius bad
Simon de Montfort superhero, Edward "Longshanks" evil personified
York good, Lancaster bad, Tudor ugly
Oliver Cromwell diabolically possessed, Charles II a Godsend
Hanover bad, Stuart good
Neville Chamberlain idiot, Winston Churchill, savior of the Realm
Treacle pudding inedible, Haggis even worse
OK?
