I love the disclaimer at the end of their report..
"The Nationwide Monthly House Price Index is prepared from information which we believe is collated with care,
but no representation is made as to its accuracy or completeness. We reserve the right to vary our methodology
and to edit or discontinue the whole or any part of the Index at any time, for regulatory or other reasons. Persons
seeking to place reliance on the Index for their own or third party commercial purposes do so entirely at their own
risk. All changes are nominal and do not allow for inflation."