'Variation', in the context of the labelography, is defined as a change to one or more of the text elements in labels, within a generic label style (a base design such as 'Banner' STEREO' or 'orange 1-EMI Box'), which is the consequence of conscious action by the typesetter. We know that EMI typesetter's would make alterations which served to identify the typesetter for a given pressing batch.
Label composition

Labels are initially printed as a base onto which disc-specific information is later printed. The base is a template which contains only those text and image elements which are common to the generic label style, elements which remain the same regardless of the artist or the disc details (the image at right illustrates a generic base label).

The integrity of the generic base layout is so consistent that it is a reliable reference against which variations in the non-generic elements can be more easily observed (to date, only one notable variation in a generic base has come to light (see mouseover image, below).
Figure 1a

Variation Defined - Part 1 - A Common Misunderstanding

In the context of this labelography, a variation is defined as one or more changes to the elements which comprise the typesetter block. It is a common misunderstanding that the shifting of an entire unchanged typesetter block relative to the generic base is also a variation - it is not!!!

The two labels in Figure 2a, right, are from two separate copies of the same album. At first glance it appears that label B is a variation of label A.

On closer examination (Figure 2b, below), the typesetter block is identical for each, i.e. there are no variances observed between any of the elements which comprise the typesetter blocks of each label.

The only difference between the two labels is the positioning of the typesetter block (Figure 2c, below-right), as a whole, relative to the generic base, resulting from block movement during the printing stage (a common occurrence).

Summary: labels with identical typesetter blocks that are printed at a different angle or at a different position relative to the generic base does not constitute a variation insofar as this labelography is concerned.
Figure 2b - mouseover for typesetter block comparison
Variation Defined - Part 2 - What Constitutes a Variation?

Any change in the style or placement of any of the elements which comprise the typesetter block is considered to be a variation. Variations can be as prominent as a change to a font, or as obscure as a change to the kerning (the space between individual text characters) of a single text character in a single word.

Examples of variances are illustrated via 'rollover' images, below, which provide comparison images on mouseover.
variance - credits variance - credits
variation - case variation - case
variation - font variation - font
variation - regular or italic variation - regular or italic
variance - kerning variance - kerning
variance - relative elements variance - relative elements
FONT
CASE
STYLE
RELATIVE ELEMENTS
KERNING
ALTERED CREDITS
 
Figure 2a
Figure 2c
It is onto this base label, at a later stage of production, that information unique to the record being pressed is printed as a block (as arranged by EMI typesetters). This information includes the artiste, record title, tracklist, 'side' numbers, record catalogue and matrix numbers, music publishing royalty stamps, and audio format.

In summary, and for the purposes of this labelography, a label comprises two distinct sets of elements:

1) generic 'base' elements which are not altered by the typesetter ( the generic base )
2) record-specific elements which can be altered by the typesetter ( the typesetter block ).