UK Data Service/ UK Data Archive Service
Their primary aim is to provide users with seamless and flexible access to the UK’s largest collection of social, economic and population data resources. They have lots of different types of data available – see their website for further information.
Google Dataset Search
Google Dataset Search can help researchers locate online data that is freely available for use. It locates files and databases on the basis of how their owners have classified them. It does not read the content of the files themselves as search engines do for web pages. This means that metadata is extremely important in order for people to find datasets.