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4mm will probably be a fraction too big making it difficult to consolidate properly and perhaps hard to screed. the coarsest grit/sharp sand you can find is fine.
We have always used sharp sand on a lean mix base with absolutely no problems, even 20years later. Apparently the reclaimed material equivalent to sharp sand is just a good, but I cant testify to that.
50mm is a bit deep in my opinion. Personally i aim for 35mm