BOCI-DecBrit =    Birds of Conservation Importance (BOCI). Uncommon and rapidly/historically declining British birdsBritish birds

BOCI-ModDec = BOCI - Moderately declining, historically declining but common internationally important British spp

ConReg-S2 = Statutory Instrument 2716- The Conservation (Natural Habitats etc) Regulations 1994. Schedule 2

ConReg-S3 = Same schedule 3
ConReg-S4 = Same schedule 4

NonIUCN_RedList_Birds1a = RDB Birds - 1a Breeding in internationally significant numbers (>20% of the north-west Europe population).

NonIUCN_RedList_Birds2 = RDB Birds - 2 Rare breeder (<300 pairs).

NonIUCN_RedList_Birds3 = RDB Birds - 3 Declining breeder (>50% sustained decline since 1960).

Status-NR (excl RedListed)   - Not sure where these are coming fro - may be locally set up
Status-NR (incl RedListed) - same
Yorks Jumb Bio Audit - same

In R6 go to Tools/Term List.  From the dropdown select Taxon Designation Type. All designations with full explanation are available here.