This month I plan to upload records from my Recording Scheme
Next month I plan to upload records from a Dipterists Forum Field Week
The latter will contain some records from the former - duplicates

I do vaguely recollect hearing that duplicates were less of a problem these days (although I can only find http://forums.nbn.org.uk/viewtopic.php?id=4317 and reference to a paper "NBN Standards for integrated online recording and verification" at http://www.nbn.org.uk/nbn_wide/media/Do … rding.pdf)

Do we have any more up to date references/advice on the topic of duplicates?

I'm additionally dealing with requests from LERCs not to re-upload their data (many thanks to them for that data). This I'm managing in R6 by having two Tags for my Scheme Surveys, one marked as "not for upload" and using the "Filter on Survey Tags" part of R6's Filter Manager accordingly.