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FBS    FACE BRICK STANDARD
Clay bricks that are selected or produced for their durability and uniformity of size and shape.

FBX    FACE BRICK EXTRA
Clay bricks that are selected or produced for their durability and high degree of uniformity of size, shape and colour.

FBA    FACE BRICK AESTHETIC
Clay bricks that are selected or produced for their durability and aesthetic effect, deriving from non-uniformity of size, shape or colour.

NFP    NON-FACING PLASTERED
Clay bricks suitable for general building work that is to be plastered.

NFX    NON-FACING EXTRA
Clay bricks suitable for use, plastered or unplastered, and general building work where durability rather than aesthetics are the key selection criteria:

• Below damp-proof course
• Under damp conditions
• Below ground level.

...E     ENGINEERING UNITS
Masonry units produced for structural or load-bearing purposes in face or non-face work, where the manufacturer supplies clay bricks to an agreed compressive strength.  An engineering unit is designated by the addition of the letter E followed by a number equal to the nominal compressive strength in megapascals, e.g. NFXE 21.