On how to get historical observational meteorological data for specific cities

[Xingxing]

I am wondering where can I find historical observational meteorological data for specific cities in UK from Met Office DataPoint and how can I obtain the dataset? For example, suppose I want data on daily air temperature (maximum, minimum and mean) and humidity in London from 2016 to 2018. Currently, only observations of the past 24h is found. Thank you for your help!