Doctors in the UK are prescribing record doses of highly addictive painkillers. Declan Lawn meets patients who have been hooked on painkillers for years.

Doctors in the UK are prescribing record doses of highly addictive painkillers. Around four million people are now taking opioids - drugs that are closely related to heroin. Reporter Declan Lawn meets patients who have been hooked on painkillers for years and he goes inside the NHS clinic helping them kick the prescription habit.