Whats the significance of the crest design. I can work out the King, but what about the castle and the lions?

Cromwell? Democratic? He was a barbaric dictator.

Firstly he was not.

Secondly the point I am making is that he fought against an absolute monarch at a time when absolute monarchy was the norm in Europe.

Or would you prefer to live in a land where the Queen could simply pick a person out on the street, say "hang him" and it would be done?

The point is that an absolute monarch was replaced by an absolute dictator.

Anyway, we're taking this way off-topic.