station slag..sometimes called a cinder block. A rwawlplug is a trade
name for originally a fiber plug inserted into masonry to take a wood
screw. Now universally plastic.
Polyfilla is a trade name for (iriginally) a cellulose based
filler..somewhat like 'spackle' ..its now a tradename for a huge variety
of filling products..
Its not a bad idea, though sand and cement mortar is better. Often pays
to make quite a large hole, paint it with THICK PVA, slap in the mortar
and push the plug into that leaving a matchstick sticking out, then when
set make good with plaster and paint..then pull the matchstick out and
screw whatever into the hole.
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