Possible Clues:

• Well established
• Well-established
• It's well established you might have been sent for this on first day at work in Government
• Existing over much time
• Enduring wish to retain support
• Pine substitute, note - it's stood the test of time
• In existence for years
• Existing over a considerable period
• Crowded commuter trains can provide this - it's traditional
• Existing over the years