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By determining the nature of all the Planck compact sources within 808.4deg^2 of large Herschel surveys, we have identified 27 candidate proto-clustersof dusty star forming galaxies (DSFGs) that are at least 3{\sigma} overdense ineither 250, 350 or 500 $\mu$mm sources. We find roughly half of all the Planckcompact sources are resolved by Herschel into multiple discrete objects, withthe other half remaining unresolved by Herschel. We find a significantdifference between versions of the Planck catalogues, with earlier releaseshosting a larger fraction of candidate proto-clusters and Galactic Cirrus thanlater releases, which we ascribe to a difference in the filters used in thecreation of the three catalogues. We find a surface density of DSFG candidateproto-clusters of (3.3 $\pm$ 0.7) x 10^(-2) sources deg^(-2), in good agreementwith previous similar studies. We find that a Planck colour selection ofS_{857}/S_{545} < 2 works well to select candidate proto-clusters, but can missproto-clusters at z < 2. The Herschel colours of individual candidateproto-cluster members indicate our candidate proto-clusters all likely all lieat z > 1. Our candidate proto-clusters are a factor of 5 times brighter at 353GHz than expected from simulations, even in the most conservative estimates.Further observations are needed to confirm whether these candidateproto-clusters are physical clusters, multiple proto-clusters along the line ofsight, or chance alignments of unassociated sources.

Candidate high-z proto-clusters among the Planck compact sources, as revealed by Herschel-SPIRE