For the purpose of investigating any matter under section 45, the OFT may by notice in writing—
A person shall not be required under this section to produce any document or disclose any information which he would be entitled to refuse to produce or disclose on grounds of legal professional privilege in proceedings in the High Court.
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .