Question to the Home Office:
To ask the Secretary of State for the Home Department, how many applications to UK Visas and Immigration, under the premium service, there are which (a) exceeded the advertised timescale for a same day or priority decision and (b) remain pending a decision, since January 2017.
UKVI transparency data provides details of how the Premium Service Centres perform against that service standard.
A link to the most recent available data is provided here;
https://www.gov.uk/government/publications/in-country-migration-data-august-2017
The table InC07 is the closest match to the information requested.