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41d small number possibly needing to edit screenplay perhaps.
I have S...G.I.T
43d less intelligent old boy beginning to transform addict
I have ..I.S.R
Any help greatly appreciated

43d is OBTUSER so another word needs correcting.

43 ob t user

41 Subscript, small number (or character, so 'possibly). Sub, edit and Script, sceenplay.

Thanks for your help. I had 47a as modernising rather than modernistic.