Is there any independent source which backs up this claim by the author since the sum of £500,000 represented quite an expenditure for the Madeleine fund considering a similar amount was also paid to Oakley International?
Having read the relevant passage from the book and followed the link £500,000 ... reference is made to other sums of £500,000 on at least one occasion (I didn't note cites) and not just in relation to Oakley which I thought was £300,000 anyway ... it appears to be a magic number.
I believe the author has recorded what he heard said and I think a peeved Lord Bell may have responded to a question in an ill advised manner, particularly for the head of a PR firm.
I think the remarks, particularly regarding the Dowler family would have met with opprobrium had it been widely known.
I don't know the chronology of the PR firms used, there is no secret about their use; there would be no requirement for one with the remit claimed by Lord Bell until well after the Murdoch settlements for libel won by the Drs McCann and their friends.
If true, I have no issue with money being spent to keep the search for Madeleine McCann in the public eye; but I wonder if it is quite as portrayed by Lord Bell, maybe as well as the front page apology it was part of the deal?