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I will be plasterboarding the underneath of the stairs and skimming it
(Well I wont be, my plasterer will) how should I handle the tile and
plaster meeting point are there kind of kick boards available to use?
do you have any suggestions?

Just done my kitchen and put a row of floor tiles vertically to meet the
wall. It looks quite good and you can probably use some standard tile
edging strip along the top.

I think you have to be careful to make sure the plaster doesn't go right to
the floor though as depending on your construction you may bridge the damp
proof course.