ITV Player will request you to allow your browser to automatically detect your location. If you confirm/allow this, then some videos will not be accessible to you, because you are "not located" in the correct ITV region.
1) If you have already confirmed the process, and you can not access the video:
-Clear your internet cache and cookies
-Use Google map to find a UK postal code
-Manually enter the postal code in the text-box and click Confirm
2) If you have not click confirm yet:
-Simply enter a valid UK postal code (use Google map to look for one_
-and click confirm
*you may need to repeat this process a few times if the postal code you used is located outside of ITV service region.