We present SCUBA-2 follow-up of 61 candidate high-redshift Planck sources .
Of these , 10 are confirmed strong gravitational lenses and comprise some of the brightest such submm sources on the observed sky , while 51 are candidate proto-cluster fields undergoing massive starburst events .
With the accompanying Herschel -SPIRE observations and assuming an empirical dust temperature prior of 34 ^ { +13 } _ { -9 } K , we provide photometric redshift and far-IR luminosity estimates for 172 SCUBA-2-selected sources within these Planck overdensity fields .
The redshift distribution of the sources peak between a redshift of 2 and 4 , with one third of the sources having S _ { 500 } / S _ { 350 } > 1 .
For the majority of the sources , we find far-IR luminosities of approximately 10 ^ { 13 } \mathrm { L } _ { \odot } , corresponding to star-formation rates of around 1000 M _ { \odot } \mathrm { yr } ^ { -1 } .
For S _ { 850 } > 8 mJy sources , we show that there is up to an order of magnitude increase in star-formation rate density and an increase in uncorrected number counts of 6 for S _ { 850 } > 8 mJy when compared to typical cosmological survey fields .
The sources detected with SCUBA-2 account for only approximately 5 per cent of the Planck flux at 353 GHz , and thus many more fainter sources are expected in these fields .