It had been assumed that the VC10K squadron formed at Brize Norton was going to be 214 Sqn, but the decision was made that it would be 101.
Nevertheless, many of the early VC10K tools were marked '214' - and many of the diagrams of the aircraft instruments in the Aircrew Manual show a heading or a selected radial of 214°, as do some in the VC10 and TriStar Maintenance School training notes.
Not a coincidence - it's because ex-214 Sqn personnel were involved in creating the original diagrams!