I will be traveling with Air China from UK to HK stopping at Capital Airport T3 for transfer.

Here are the procedures: Flight Arrival- Transfer Procedures- Have your passport stamped at the Immigration Desk- Security Check- Custom Inspection- Waiting & Boarding. The minimum connection time is 60 minutes. You can catch the flight if you finish these procedures as soon as possible.

You can take APM train to 2F, T3-C from 2F, T3-E. Then, you can find E gates on 3F, T3-C.

If your flight delays and cannot make the connection, you need to inform the staff of the connecting flight. Maybe, they can reissue the ticket for you. Good luck!