The advert got a LOT of publicity featuring in news broadcast and features programmes. There were also short adverts of famous British people (such as David Cameron, leader of the Conservative Party) saying "I'll be watching it".
The British Heart Foundation also had a countdown clock for the advert, which was shown once only.
In the advert a man is in a chair. Berkoff comes in and punches him hard in the chest, to show the pain an attack can bring. He continues demonstrating the sort of symptoms on the victim.
A good effective advert. With its once-only showing it got a lot of publicity, much more than if it had run for a few weeks.
Didn't Berkoff also do the voiceover for a McDonalds advert a while ago?
Iain