Depending on where the event or meeting you wish to attend is being held you will use different entrances to the Church Centre. 

For the Church Centre Hall, use the path accross from the North Porch of the church. 

For the Church Office, the Team Rector's Office, or the Lounge (on the second floor), use the door to the Centre off of St Helen's Court. 

Access to the church itself is normally through the North Porch.