Possible Clues:

• Look at setting off a bomb with old flame
• Scrutinise test in English
• See former Ugandan dictator in river
• Look at fire rising over explosive device
• Investigate when chopper's sent up with explosive device
• Inspect former pit round area
• A short time in river Test
• Test needs article to be lowered into old pit
• Analyse, test
• Inspect sack returned where coal comes from