Yeah that ticking would be the purge solenoid. To confirm, if you look behind the box where the hoses go into it you'll see the solenoid fitted in one of the hoses. Put your finger on it and you'll feel the ticking.
This is a normal thing. The ticking does not mean there is any problem with it. It's just that the internal 'sound insulation' in the solenoid wears out after a while. So the only problem is the annoying ticking noise. If you can live with that then just don't worry about it.
If you wanna eliminate the noise, usually it's caused by the fact that the solenoid and/or hoses it's attached to are contacting the wheel arch splash shield or similar and thus the noise is getting transmitted through the vehicle. In mine I just got some adhesive-backed d-section hollow rubber sealing strip and stuck some pieces of that on the solenoid and hoses to insulate them where they touch things. That basically eliminated the noise, but it will wear out over time still.
Else you can replace the solenoid of course but the genuine ones will always go the same way after a while. Maybe you could find a better and/or cheaper aftermarket solenoid and fit it up yourself - it's only a basic 12v solenoid valve.
Steve.
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