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Its the other way around, TfL wouldn't want it themselves. They didnt want to pay for the proposed extension to Tring, which would have knackered the slow lines on the WCML.
Bear in mind that declaring congested infrastructure, that NR needs a plan to resolve it. Whether thats tinkering at the edges, a timetable change or reduction or new infrastructure. Normally its not a cheap process. You don't just declare it and say oh well.