House prices in the UK show mixed performance in May, according to figures cited from the Office for National Statistics (ONS). The average cost of a home rises by 2.7% in May compared with the previous period referenced in the data. At the same time, the reporting highlights that London prices are falling, contrasting with improvements seen in other parts of the country. The ONS figures are used to describe overall movement in house values, while the London-specific trend is presented as weaker than the national average. The articles also point readers to an online tool to check how much their property value has changed, but the core figures cited remain the 2.7% overall rise in May and the reported decline in London. The available information does not specify the exact size of the London drop or provide further breakdowns beyond the national increase and the directional comparison between London and the rest of the UK.