Our friends in Britain appear to have improved their heart health due to changes in their lifestyles. "Between 1981 and 2000, the most recent year for which data was available, heart disease deaths fell by 54%, which adds up to nearly 30,000 lives saved. Researchers credit a large decline in cigarette use, and the increasing popularity of exercise, as being the factors most greatly responsible." You can find the information here: 
http://tinyurl.com/b8cy6
I'll be on the lookout for any additional info about the study/ies. I did a google search and did not come up with anything.
On another note, here is a website that has heart operation games! http://www.bhf.org.uk/ Very interesting.