StatXplore is a DWP tool that allows you to create statistics about different aspects of a range of benefits, including DLA, ESA and PIP.
So, for example, you can find out how many people claim a particular benefit in a particular area, what proportion of claims are successful, how many people have had their award reviewed, how many people get PIP for a specific health condition and so on.
You can use StatXplore as a guest from the Home page here:
https://stat-xplore.dwp.gov.uk/webapi/jsf/dataCatalogueExplorer.xhtml
To use all the features, such as saving and downloading tables you need to register, which is free and you only need to provide an email address. There is the option to provide more details but you can ignore these.
You can register here: