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We present the spectroscopic confirmation of the brightest knowngravitationally lensed Lyman break galaxy in the Epoch of Reionisation,A1703-zD1, through the detection of [C II] at a redshift of z = 6.8269 +/-0.0004. This source was selected behind the strong lensing cluster Abell 1703,with an intrinsic L$_{UV}$ ~ L$^*$$_{z=7}$ luminosity and a very blueSpitzer/IRAC [3.6]-[4.5] colour, implying high equivalent width line emissionof [O III]+H$\beta$. [C II] is reliably detected at 6.1$\sigma$ co-spatial withthe rest-frame UV counterpart, showing similar spatial extent. Correcting forthe lensing magnification, the [C II] luminosity in A1703-zD1 is broadlyconsistent with the local L$_{[CII]}$ - SFR relation. We find a clear velocitygradient of 103 +/- 22 km/s across the source which possibly indicates rotationor an ongoing merger. We furthermore present spectral scans with no detected [CII] above 4.6$\sigma$ in two unlensed Lyman break galaxies in the EGS-CANDELSfield at z ~ 6.6 - 6.9. This is the first time that NOEMA has been successfullyused to observe [C II] in a 'normal' star-forming galaxy at z > 6, and ourresults demonstrate its capability to complement ALMA in confirming galaxies inthe Epoch of Reionisation.

Spectroscopic confirmation of a gravitationally lensed Lyman break galaxy at z$_{[CII]}$ = 6.827 using NOEMA