Hi Irene
there is no minimum standard set by DWP and we don't report to them.
However there is a good practice guide from DWP which we have used recently for a QA health check. (link below)
https://www.gov.uk/government/publications/housing-benefit-quality-assurance-process-good-practice-guide
I'll send you our QC procedures which you may find useful
thanks Mick
