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[Abridged] Aims: This work focuses on one lensed system, HATLASJ142935.3-002836 (H1429-0028), selected in the Herschel-ATLAS field. Gatheringa rich, multi-wavelength dataset, we aim to confirm the lensing hypothesis andmodel the background source's morphology and dynamics, as well as to provide afull physical characterisation. Methods: Multi-wavelength high-resolution datais utilised to assess the nature of the system. A lensing-analysis algorithmwhich simultaneously fits different wavebands is adopted to characterise thelens. The background galaxy dynamical information is studied by reconstructingthe 3-D source-plane of the ALMA CO(J:4-3) transition. Near-IR imaging from HSTand Keck-AO allows to constrain rest-frame optical photometry independently forthe foreground and background systems. Physical parameters (such as stellar anddust masses) are estimated via modelling of the spectral energy distributiontaking into account source blending, foreground obscuration, and differentialmagnification. Results: The system comprises a foreground edge-on disk galaxy(at z_sp=0.218) with an almost complete Einstein ring around it. The backgroundsource (at z_sp=1.027) is magnified by a factor of ~8-10 depending onwavelength. It is comprised of two components and a tens of kpc long tidal tailresembling the Antennae merger. As a whole, the system is a massive stellarsystem (1.32[-0.41,+0.63] x1E11 Mo) forming stars at a rate of 394+-90 Mo/yr,and has a significant gas reservoir M_ISM = 4.6+-1.7 x1E10 Mo. Its depletiontime due to star formation alone is thus expected to betau_SF=M_ISM/SFR=117+-51 Myr. The dynamical mass of one of the components isestimated to be 5.8+-1.7 x1E10 Mo, and, together with the photometric totalmass estimate, it implies that H1429-0028 is a major merger system(1:2.8[-1.5,+1.8]).

Herschel-ATLAS and ALMA: HATLAS J142935.3-002836, a lensed major merger at redshift 1.027