The Data Protection Act 1998 tends to be for things like banking records, medical records. 

He could argue that the film is a piece of "art", which was made by mutual agreement, and therefore qualifies under the "freedom of expression" exemption http://www.legislation.gov.uk/ukpga/1998/29/section/32 She would then have to prove that he knew that he did not have her consent either for the filming or for the resulting film to be put in the public domain. 

As a malicious e-communication, all she needs to demonstrate is that her ex-boyfriend knowingly communicated - "to another person a letter, electronic communication or article of any description which conveys a message which is indecent or grossly offensive." http://www.legislation.gov.uk/ukpga/1988/27 It might only be necessary to prove that he knowingly posted the video to a number of porn websites, adding titles that "convey a message which is indecent or grossly offensive".

I'm less sure about the civil case though, as the article states:
> Victims of revenge pornography are unable to sue for defamation, as although the images and videos posted of them might be damaging, they depict events that really happened and therefore do not qualify as “false statements”.

The Daily Mail has reported http://www.dailymail.co.uk/news/article-3110150/Revenge-porn-victim-seek-landmark-case-against-former-boyfriend-suing-prosecuting-time.html "The exact terms of her civil case are not clear, but she claims the explicit videos have caused her to lose subscribers and damaged her earnings from advertising.

Again, I'm guessing her lawyer is going to try and argue something along the lines of which particular websites they were uploaded to and what titles he added to show some form of defamation, unless the civil case has nothing to do with defamation and Olivarius has something really clever in mind.

Marie