Why is the NHS struggling to get hold of some life-saving medicines for its patients? Allan Urry reveals serious concern over the availability of some drugs used in the treatment of cancer and for pain control. Pharmacists and doctors say they face a daily battle to get access to a range of medicines and either end up buying alternatives at a greater cost to the health service or using less effective alternatives which can compromise patient care. So is the Government doing enough to ensure essential supplies are available? And has Whitehall's drive to push down the NHS drugs bill deterred some manufacturers from supplying the UK? Reporter: Allan Urry Producer: Emma Forde.