Analysis Summary:

The article appears mostly accurate based on the provided sources, with the primary claim about illegal cigarettes signaling a deeper problem being supported. There's a slight bias towards highlighting the negative aspects of illegal cigarettes and their impact on high streets. The claim about dead flies and asbestos is not directly verified by the provided sources, requiring reliance on internal knowledge.

Detailed Analysis:

• Claim:** "Some black market cigarettes have been found to contain dead flies and asbestos." This claim is not directly verified by the provided sources. While the sources discuss the dangers of illegal cigarettes, they don't specifically mention dead flies and asbestos. This relies on internal knowledge that illegal cigarettes can contain harmful substances.
• Claim:** "But the trade nods to a wider issue, a BBC investigation has found." This is supported by the title and snippets of Verification Source #1, Verification Source #2, Verification Source #3 and Verification Source #4, which all indicate that the sale of illegal cigarettes signals a deeper problem.
• Claim:** "Sale of illegal cigarettes signals deeper problem with British high streets." This is the central theme and is supported by the titles and snippets of Verification Source #1, Verification Source #2, Verification Source #3 and Verification Source #4.

Supporting Evidence/Contradictions:

• Agreement:** Verification Source #1, Verification Source #2, Verification Source #3 and Verification Source #4 all agree on the core issue: the sale of illegal cigarettes signals a deeper problem with British high streets.
• Lack of Coverage:** None of the provided sources directly confirm the claim about dead flies and asbestos in illegal cigarettes. This requires reliance on general knowledge about the contents of counterfeit goods.
• Internal Knowledge:** Illegal cigarettes are known to contain various harmful substances due to lack of regulation and quality control. This supports the plausibility of the claim about dead flies and asbestos, even though it's not explicitly verified by the provided sources. Verification Source #5 discusses the dangers of illegal alcohol, implying that illegal products can be dangerous.