The Department for Social Security was a department of British government who supported and looked after those who could not work.
At the Singles Night at the Phoenix Club, Brian fell deeply in love with a woman named Beverly. After spending a lot of time together, Beverley revealed that she in fact worked for the DSS and that she was only at the Singles Evening during a fraud investigation. Despite her trying to persuade Brian that she truly loved him, Brian broke the relationship.
During his unimpressive interview for barkeeper, Spencer was given the job by Jerry St. Clair for the simple reason that the DSS would pay for his wages.