With the Notice to Proceed on HS2's Phase 1, Government is obliged to publish a Full Business Case (FBC). Dated April 2020, it makes a fascinating read, clarifying why Government decided to proceed with HS2 - there is no realistic alternative. 2020 May 6, Jim Steer, “Full Business Case offers fresh insight into HS2's prospects”, in Rail, page 50:
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FBCs
Number=Plur
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FBC en · PROPN
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(abbreviation, alt-of, initialism) Initialism of Fox Broadcasting Company.