Several organisations offer the Safe Researcher Training (SRT) course that you must pass to obtain Office for National Statistics (ONS) Accredited Researcher status. SRT courses are provided by:
Scottish Centre for Administrative Data Research (SCADR): see ONS Safe Researcher Training course (ONS-SRT) | SCADR
ONS: email srs.customer.support@ons.gov.uk for the dates of forthcoming courses
UK Data Service: see Training and events — UK Data Service