:"Because of him the English created the concept of parliamentary sovereignty, which we later exported round the world - ironically, and eventually, even to Ireland." - The Irish had been pressing for parliamentry sovereignty since before 1494, only for the English parliament to repress it at every turn. In 1782 in we got it de jure but de facto parliament was still unsovereign. 19 years later even that fraud was revoked. It was not until 1922, following a bloody guerellia war against the British (viz. English) parliament that a sovereign parliament was "allowed" to exist in Ireland. Meanwhile, look north and you'll see that parliamentary sovereignty was wrestled from the king by the Scottish immediately prior to Cromwellian regime - only be run rough-shod over by marauding English armies. It was those constitutional changes, put in train by the Scottish, that were aped by the English in their "Commonwealth". 
 :Parliamentary sovereignty, "a concept created by the English"? Don't make me laugh! "Exported around the world"? The English exporting democracy and freedom rather than violence and oppression?? Now you've ventured into the world of the absurd! 
 :First written constitution? Cromwell? The English? No. That honour would fall to the Irish in 1641. (But so what if Cromwell had a constitution? The USSR had volumous constitutions but was hardly a pinnacle of democracy or freedom?)  
 :Now back on topic, what do you propose to do about the History section?