On a separate note, ISTR that there is a BA guide to how to read the fare bases for these new short-haul fare families. IIRC, the fare basis includes things like a letter that indicates whether the fare is from LHR, to LHR, from LGW, to LGW, from LCY or to LCY; and other letters or digits to indicate other features of the fare basis.

Is there an insider who is able and permitted to post this guide?