The 1926 varieties : you need to say whether these relate to the ME or earlier effigy.
The 1961 varieties : the disappearance of EF and CT are purely due to die fill; people were once excited about them and they appeared in lists as varieties, but I'd say they haven't been listed for decades as people stopped regarding them as anything but gradually filling dies and therefore nothing to get excited about. The polished blank (not die IMO) is more interesting, but not so well known is that there are several CuNi strikes after 1953 that are on polished blanks. I can't remember the dates offhand but I have one halfcrown and one 6d - both 50s - that are definitely on polished blanks. My theory is that they produced way too many for 1953 proofs and slowly used them up.