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You get into the earlier age of Anglo-Saxon rule & from time to time a Bretwella (sp) was elected. There's no definitive starting date for the "Kingdom of England". If you wanna say that Alfred the Great was the King of the nation of England, I won't argue. Alfred was a younger son & his older brother left sons to inherit... Some laws are made to be broken, no? A claim has been made that the older brother's line continued unbroken down to Godwine, which is where Harald II's claim came from.

The time of Æthelred "the Unready" makes the whole Kingdom question less clear, with Sweyn ruling for a few weeks in the middle of his reign, though I guess the same argument could be made during times of post Norman conquest English civil wars.

Welsh law was very probably incorporated into English-Mercian law in the Midland region near Wales,

True. While I don't want to wander off into speculation about King Arthur, it is possible Welsh/British law is much stronger than my earlier statement gave credit.