Having researched this elsewhere, the settings for a UK stage play appear to be incorrect. They are certainly not consistent with any published UK stage play.
The advice in this web page seems to be accurate: comedyplays.co.uk/cpv5/scripts/spf.pdf
Specifically:
Character names should be bold and CAPITALS
Character names contained in stage directions should be ITALIC AND CAPITALS (the latter point here is not invariably observed)
Dialogue is indented from the character name
Stage directions are to be in italics
Stage directions within dialogue should be (in brackets and italics)
I am in the process of changing the formatting of a script right now and, since this will involve the changing of capitalised stage directions to lower case, I think this will involve a lot of retyping (?) If there is a short cut, please let me know.