Which entrance do I go in?

In order to get into Committee Room 4A you will need to enter through the Cromwell Green visitor entrance. You can find more information about how to get there through this link - https://www.parliament.uk/visiting/access/directions/#:~:text=Most%20visitors%20to%20UK%20Parliament,number%205%20on%20

How early should I arrive?

You and your belongings will need to go through airport-style security before entering Parliament. The wait time to get through security is up to 30 minutes. At busier times, the average time is 45 minutes. The queue starts outside the building so dress for the weather.