Hi Pendan,
Links directing other forum users to external sites is not allowed here on the forums. As such, your post has been hidden. However, your good intent is greatly appreciated.
Reporting the player in-game for "Staff Impersonation" is best in this situation. Jagex will be able to review the evidence from the report in-game and take the appropriate action to prevent situations like this from happening in the future.
Jagex has an email for players to submit emails regarding phishing attempts. The email is "reportphishing@jagex" with the most common ending after "@jagex". In the email, you will want to provide the link you were given.
Thanks and all the best.
24-Jun-2014 05:19:47