The Supercar Blog broke the story, and McLaren MSO just confirmed to UK car blog Pistonheads that the " BC-03 is a bespoke customer commission being created by McLaren Special Operations." It wouldn't divulge anything more "because the specifics of the project are confidential between MSO and its client." We have only circumstantial evidence and hearsay at the moment, but two days after dan_am_i posted the slide, he returned to Instagram to post a side shot of the McLaren Ultimate VGT concept with #BC03 as one of the hashtags.
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