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We present e-MERLIN and EVN observations which reveal unambiguous jetactivity within radio quiet quasar HS~0810+2554. With an intrinsic flux densityof 880~nJy, this is the faintest radio source ever imaged. The findings presentnew evidence against the idea that radio loud and radio quiet quasars arepowered by different underlying radio emission mechanisms, showing instead thatthe same AGN mechanism can operate as the dominant source of radio emissioneven in the very lowest radio luminosity quasars. Thanks to stronggravitational lensing, our source is not only visible, but with VLBI is imagedto a scale of just 0.27~pc: the highest ever resolution image of a radio quietquasar. Brightness temperatures of at least $8.4\times 10^6$~K are associatedwith two highly compact components, and subsequent modelling of the lensedsystem has revealed that the components are linearly aligned on opposing sidesof the optical quasar core, with the typical morphology of a compact symmetricobject (CSO). Given that this source has been found to fall on the radio--FIRcorrelation, we suggest that the radio--FIR correlation cannot always be usedto rule out AGN activity in favour of star-formation activity. The correlation-- or at least its scatter -- may conceal the coexistence of kinetic andradiative feedback modes in AGN. Modelling of the lensing mass itself points toa non-smooth mass distribution, hinting at the presence of dark mattersubstructure which has manifested as astrometric perturbations of the VLBIlensed images, posing no threat to the CDM paradigm.

Strong lensing reveals jets in a sub-microJy radio quiet quasar