A report from the 2021 metadata quality review undertaken for discovery level records produced by the NERC data centres. This includes a comparison of the results from this round of metadata checks with previous rounds which revealed that despite a doubling of metadata records for the EDS as a whole since the previous review round in 2016, metadata quality was maintained at a high standard. Having adapted the review process slightly from the 2016 round it was possible to isolate data centre records coming from collections of similarly templated records. Consequently, this review was able to give further insight as to the breakdown of record quality by record type. From this the strength of taking templating approaches to metadata record creation was demonstrated with resulting records being of higher quality overall, though there are some variance in results still. Additionally, non-geographic datasets were examined for the first time as an identifiable class of records within the sample, which showed a slightly lower than average scores - but again with a large spread of metadata quality scores.