UK Ministry of Defence has confirmed it will not chase the schedule but will only begin production of Challenger 3 main battle tanks after comprehensive testing is fully complete.
According to UK Defence Journal, this response was given to parliamentary inquiries at the Ministry of Defence. Officials emphasized that project timelines will be continuously reviewed according to needs, risks, and progress achieved.
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The ministry is deliberately avoiding setting a firm production start date to reduce the likelihood of delays or overlooking defects. This makes the previously announced readiness date of late 2020s rather approximate.
Defense Express notes that transitioning to military equipment production only after complete testing sounds routine and mandatory especially in peacetime when there's no critical need to rapidly supply armaments to the frontline.

However, it's worth remembering that many Western defense projects experience years of delays due to various problems and complications. To avoid issues, an unfinished product might be pushed into serial production while refinements continue, which can end badly as happened with Spain's Dragon armored personnel carriers.
Production can also begin while ignoring problems identified during testing. These issues later resurface, reducing troop combat effectiveness and national defense capabilities.

The British have a particularly close example in the Ajax armored vehicle family, which was banned from use less than a month after achieving initial readiness due to injuries to soldiers.Solving this situation may be simpler by purchasing a new infantry fighting vehicle rather than fixing the existing design.
Therefore, it sounds right that Challenger 3 main battle tanks will be more thoroughly tested before serial production. However, this is already a serious long-term construction project facing poor quality of old, worn hulls that will be used in production.
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