Requesting Permission to use song "The Fear"

We requested permission from the artist to use their song in our mediat project music video. We first checked the artist's website for an official contact email address however there did not appear to be one listen anywhere nor any form of contact form and so we utilised other methods in order to contact the artist, a message on Twitter directed at the artist's Twitter account and a private message on youtube. We also tried commenting on the music video page for the song we wished to use on youtube however due to the nature of comments and the popularity of the artist these comments were quickly buried under other comments from other fans of the artist and so proved to be an ineffective way of contacting the artist as they are unlikely to have the time to go through every message they receive therefore clearer forms, particularly youtube private messages, are a much more reliable way of contacting the artist. A direct email address would ofcourse have been even more effective but there does not appear to be one listed to this day.