Bob Mannix wrote:

You don't have to answer them but you do have to tell the truth if you do.
Choosing to remain silent is not the same as saying "I don't know" (if it
can be shown you did know). They will draw their own conclusions from a
failure to answer of course but that's fair.

Solicitors (IME) will generally urge answers of "I don't know" in cases
where there is *any* doubt over an answer.

--
Cheers,

John.

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