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Responding to questions as to why costs were allowed to spiral for so long, an NHS spokesperson said the length of time it takes public sector organisations to procure contracts "can vary", and the nature of the contract was "complex".
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But e-bikes containing lithium-ion batteries are a newer challenge. "When a battery fails, it doesn't necessarily ignite, it will often produce some off-gases," says Stephen Welch, senior lecturer at the University of Edinburgh's Fire Research Centre. "Those off-gases are toxic and flammable. If they accumulate, you can have an explosion risk."