Democracy was invented in Athens, c 600 BC, not in England.
Common Law is English yes - it arose as a way of merging the Saxon laws with the Norman laws. Note - Scotland is not purely common law - it has it’s own law, “Scots law” which is a blend of common law and civil law
And yes, it gave us the practical science and engineering setting the stage for the industrial revolution.
Saying it hasn’t produce anything of note is veering too much to one side and as hysterically false as the other side which over-glorifies England. There is a balance between the two that is accurate
That kind of democracy - the democracy you see on display in your typical HOA collapsed pretty quickly and pretty much for the same reasons, and wasn't started again for a couple of millenia. That kind of democracy fails because there are no institutional restraints [e.g. the US Senate] to restrain the passions of the moment or the rise of demagogues like Schifface.
Our system of government grew out of the British system, which was pretty much sui generis evolving over 1000 years from the collapse of Rome to the American Revolution. That system survived because it continued to evolve and grow in order to survive.