The former is the gold standard as it includes every sale but, because it is based on the date of entry, it lags the Nationwide index – which is based on mortgage offers issued up to the 25th of the relevant month.
By definition, the Nationwide index doesn’t include cash sales and will include some properties that ultimately are either not sold at the price on which the mortgage offer is based, or where the sale does not complete. However, neither of these factors will have a material impact on the price…
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https://www.scotsman.com/business/overview-housing-and-mortgage-market-comment-3028014