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Beyond fronted negative adverbials, formal and literary English uses inversion after conditional "had/were/should" (without "if") and after certain place adverbials, adding a formal or dramatic tone.
If I had known, I would have acted differently, had I known.
Had I known, I would have acted differently. β Inversion after "had" replaces "if," it doesn't add to it.
Should you needed assistance, contact us.
Should you need assistance, contact us. β Use the base form after inverted "should," not the past tense.
Should you have any questions, call me.
Had I seen it, I would have said something.