Flowchart developed for the deep fields to select the most appropriate method (end-point) for identification (LR or visual) based on properties of the radio source and LR-identification (if any). The “LR-ID” end-point indicates that the LR cross-match is accepted (see Sect. 4.2). Sources with the end-point of “LGZ”, “pre-filter” and “expert-user workflow” are sent to their respective visual classification and identification workflows (see Sect. 4.3). The numbers and percentages of sources at each end-point relate to the total number of sources in the  PYBDSF catalogue within our defined multi-wavelength area (FLAG_OVERLAP = 7; see Table 5) and not in the Spitzer-masked region (FLAG_CLEAN ≠ 3; see Table 4), corresponding to 31059 PYBDSF sources. Table 6 lists the definitions used for each decision block. The decision tree is described in detail in Sect. 4.1. In ELAIS-N1, 27056 (87.1%) of sources were selected as suitable for analysis by the statistical LR method, with the rest (4003 sources = 12.9%) selected as requiring some form of visual classification.