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We report a remarkable over-density of high-redshift submillimetre galaxies(SMG), 4-7 times the background, around a statistically complete sample oftwelve 250-micron selected galaxies at z=0.35, which were targeted by ALMA in astudy of gas tracers. This over-density is consistent with the effect oflensing by the halos hosting the target z=0.35 galaxies. The angularcross-correlation in this sample is consistent with statistical measures ofthis effect made using larger sub-mm samples. The magnitude of the over-densityas a function of radial separation is consistent with intermediate scalelensing by halos of order 7x 10^{13} M_o, which should host one or possibly twobright galaxies and several smaller satellites. This is supported byobservational evidence of interaction with satellites in four out of the sixfields with SMG, and membership of a spectroscopically defined group for afifth. We also investigate the impact of these SMG on the reported Herschelfluxes of the z=0.35 galaxies, as they produce significant contamination in the350 and 500-micron Herschel bands. The higher than random incidence of theseboosting events implies a significantly larger bias in the sub-mm colours ofHerschel sources associated with z<0.7 galaxies than has previously beenassumed, with f_boost = 1.13, 1.26, 1.44 at 250, 350 and 500-microns. Thiscould have implications for studies of spectral energy distributions, sourcecounts and luminosity functions based on Herschel samples at z=0.2-0.7.

Over-density of SMGs in fields containing z~0.3 galaxies: magnification bias and the implications for studies of galaxy evolution