On November 5th 2012 Season 5 will be released in the UK :))
http://www.amazon.co.uk/Heartland-The-Complete-Fifth-Season/dp/B009G247QG/ref=sr_1_39?ie=UTF8&qid=1348676882&sr=8-39
http://www.amazon.co.uk/Heartland-The-Complete-Fifth-Season/dp/B009G247QG/ref=sr_1_39?ie=UTF8&qid=1348676882&sr=8-39