Parliamentary Voting System and Constituencies Bill - Third Reading is on Monday in the Lords - and then ping pong begins on Tuesday.
Two bills are due to have their Second Readings in the Lords - The Pensions Bill on Tuesday and the Postal Services Bill on Wednesday. Monday should see the Second Reading in the Commons of the Budget Responsibility & National Audit Bill.
The Stages that a bill has to go through is explained here. A video explaining the process is accessible here.