Appendix 4 of CDM 2015 guidance doc "Managing H&S in Construction" advises what should be included.

Hi Ron,

Yes the business is not involved in Construction.

I gather this would be correct, yes.

Your first question should be: What's it for?

Need it be hard copy or could it be maintained electronically (e.g. sharepoint) or via web or intranet, with hyperlinks to current and up-to-date versions of all relevant documents.

Induction information is usually best kept as a separate resource, different employee groups or departments often need specific induction information.

I would say a general H&S file (as oppose to the specific requirements under CDM) is old hat. At the last place I worked I used the intranet for all my documents and links to outside sources of information. Much easier to navigate, keep upto date and of course it can be shared across the organisation.
I suspect that there are more modern ways to do this nowadays but they are all better than a paper file that will be gathering dust in the corner of an office.
Once found a copy of an old H&S file while doing clear out. It was a) covered in dust and b) had the following note attached to it “To (Name of old H&S manager) please stop putting any old crap in this file. Signed (former H&S Adviser) “. Sums it up really.