7In estimating the weight, if any, to be attached to a statement admissible in evidence by virtue of section 68 above regard shall be had to all the circumstances from which any inference can reasonably be drawn as to the accuracy or otherwise of the statement and, in particular—
(a)to the question whether or not the person who supplied the information from which the record containing the statement was compiled did so contemporaneously with the occurrence or existence of the facts dealt with in that information ; and
(b)to the question whether or not that person, or any other person concerned with compiling or keeping the record containing the statement, had any incentive to conceal or misrepresent the facts.