This is a computational limitation issue and we didn’t want to slow down the website. We are confident that it is not significant. So for example, in the whole of London for November 2015, the total value of all sales we are showing is £5,359,840,000. However, if you total up all the sales individually (and we list all of the prices without roundings), it comes to £5,359,840,285. So just £285 difference out of £5.3 billion in sales.
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