sub-image were selected as possible counterparts for each 10C source. For the one source without a GMRT image, all objects within the $3\sigma$ contour in the WSRT map were selected instead. In total, 30 possible counterparts were identified for the eight sources. These are included in later discussion.

Photometric redshift fitting {#section:lephare}
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The two photometric redshift catalogues described in Section \[section:multi-data\] do not contain redshift values for all the sources in this sample with multi-wavelength data available, so we performed our own photometric redshift fitting. The publicly available photometric redshift code <span style="font-variant:small-caps;">Le Phare</span>[^3] was used to compute photometric redshifts for the sources in this sample with counterparts in the Data Fusion catalogue. The code takes an input library of spectral energy distribution (SED) templates, which are assumed to represent the SEDs of the observed sample, and shifts them to a range of redshift values. These templates are then fitted to the photometric data, and a least-squares minimisation is used to select the best-fitting SED template for each source. The redshift of the best-fitting template is then adopted as the redshift estimate. The photometric data used here was from the Data Fusion catalogue (see Section \[section:FUSED-data\]), which has up 