Thank you, Paul. I will add the Kew photos to the GMB RD database in due course (with a link to this topic thread).
As you say, confusing - but I assume that the Kew photo for RD 214357 specifically refers to the decorative pattern on the foot only, whereas that for RD 214358 is specifically for the decorative pattern of linked rings above tear-shaped studded loops.
Neither RD would seem to refer to a particular shape as the decorative features on the foot and bowl occur on the RD 214357-358 comport shown in reply #7 of this thread.
Fred.