Key points from article :
Heart failure affects about 920,000 people in the UK.
"Pumping" patch contains millions of living, beating stem cells.
Patch has grown in a lab from a sample of the patient's skin cells.
After being sewn in the heart, patch turns into healthy working muscle and replace the damaged area.
Tests in rabbits show the patch appears safe.
Patient trials should start in the next 2 years.
Patches could save over 52000 hearts in London.
Research is being done by Imperial College London experts.
