Yes I did. Here is the link.
www.oliverwyman.com/content/dam/oliver-wyman/v2/publications/2018/july/Brexit_Costs_Up_Prices_Up.pdf
I have Googled the paper myself as it was not included in the news article (which was only for headline grab).
I am personally involved in writing some similar consultancy papers (not Brexit related though) and I know in lot of cases it involves several subjective weightage factors. Often there are no ways of verifying these numbers either.
Olvery Wyman is not a very well known consulting firm e.g. not in same calibre of McKinsey, BCG, Bain, PWC, E&Y etc.
Consultancy firms produce papers based on who pays them - the true analysis what they do in-house (on Brexit impact, they all are doing it) is very unlikely to be shared in public domain.
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