Each House considers the other’s amendments
When a Bill has passed through third reading in both Houses it is returned to the first House (where it started) for the second House's amendments (proposals for change) to be considered.
Both Houses must agree on the exact wording of the Bill.
There is no set time period between the third reading of a Bill and consideration of any Commons or Lords amendments.
If the Commons makes amendments to the Bill, the Lords must consider them and either agree or disagree to the amendments or make alternative proposals.
If the Lords disagrees with any Commons amendments, or makes alternative proposals, then the Bill is sent back to the Commons.
A Bill may go back and forth between each House (‘Ping Pong’) until both Houses reach agreement.
What happens after consideration of amendments?
Once the Commons and Lords agree on the final version of the Bill, it can receive Royal Assent and become an Act of Parliament (the proposals of the Bill now become law).
In exceptional cases, when the two Houses do not reach agreement, the Bill falls. If certain conditions are met, the Commons can use the Parliament Acts to pass the Bill, without the consent of the Lords, in the following session.