for luck
No ideas were introduced into England by the Commonwealth. The Commonwealth was established from the British Empire with the Queen being the head. England, being the main member state of U.K, therefore had nothing introduced into it from the Commonwealth opposed to England introducing ideas into Commonwealth member countries. So I'm not sure if this is what you meant, but I think your question should be "What two ideas did England introduce into the Commonwealth?" and in that case I would say that there are a lot of ideas that were introduced, too many to list without having more specific details on what type of ideas you want listing.
The Civil War.
V for Vendetta
the civil war
to get herppies
behind the bow
V for Vendetta Beneath this mask there is more than flesh. Beneath this mask there is an idea, Mr. Creedy, and ideas are bulletproof. - V
Delaware
Delaware
The documents which explained the ideas behind, and which urged for the ratification of, the Constitution of the United States of America are known as The Federalist Papers.
having faith
By having grate ideas lol