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(1) Subject to sections 7 and 8 below, a person who has become a rehabilitated person for the purposes of this Act in respect of a conviction shall be treated for all purposes in law as a person who has not committed or been charged with or prosecuted for or convicted of or sentenced for the offence or offences which were the subject of that conviction; and, notwithstanding the provisions of any other enactment or rule of law to the contrary, but subject as aforesaid-

(a) no evidence shall be admissible in any proceedings before a judicial authority exercising its jurisdiction or functions in Great Britain to prove that any such person has committed or been charged with or prosecuted for or convicted of or sentenced for any offence which was the subject of a spent conviction; and

(b) a person shall not, in any such proceedings, be asked, and, if asked, shall not be required to answer, any question relating to his past which cannot be answered without acknowledging or referring to a spent conviction or spent convictions or any circumstances ancillary thereto.

(2) Subject to the provisions of any order made under subsection (4) below, where a question seeking information with respect to a person's previous convictions, offences, conduct or circumstances is put to him or to any other person otherwise than in proceedings before a judicial authority-

(a) the question shall be treated as not relating to spent convictions or to any circumstances ancillary to spent convictions, and the answer thereto may be framed accordingly; and

(b) the person questioned shall not be subjected to any liability or otherwise prejudiced in law by reason of any failure to acknowledge or disclose a spent conviction or any circumstances ancillary to a spent conviction in his answer to the question.

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(2) Nothing in section 4(1) above shall affect the determination of any issue, or prevent the admission or requirement of any evidence, relating to a person's previous convictions or to circumstances ancillary thereto -

(a) in any criminal proceedings in Great Britain (including any appeal or reference in a criminal matter);

(f) in any proceedings in which he is a party or a witness, provided that ... he consents to the determination of the issue or, as the case may be the admission or requirement of the evidence notwithstanding the provisions of section 4(1).

(3) If at any stage in any proceedings before a judicial authority in Great Britain (not being proceedings to which, by virtue of any of paragraphs (a) to (e) of subsection (2) above or of any order for the time being in force under subsection (4) below, section 4(1) above has no application, or proceedings to which section 8 below applies) the authority is satisfied, in the light of any considerations which appear to it to be relevant (including any evidence which has been or may thereafter be put before it), that justice cannot be done in the case except by admitting or requiring evidence relating to a person's spent convictions or to circumstances ancillary thereto, that authority may admit or, as the case may be, require the evidence in question notwithstanding the provisions of subsection (1) of section 4 above, and may determine any issue to which the evidence relates in disregard, so far as necessary, of those provisions.