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We present VLA detections of radio emission in four four-image gravitationallens systems with quasar sources: HS0810+2554, RXJ0911+0511, HE0435$-$1223 andSDSSJ0924+0219, and e-MERLIN observations of two of the systems. The firstthree are detected at a high level of significance, and SDSS J0924+0219 isdetected. HS0810+2554 is resolved, allowing us for the first time to achieve10-mas resolution of the source frame in the structure of a radio quiet quasar.The others are unresolved or marginally resolved. All four objects are amongthe faintest radio sources yet detected, with intrinsic flux densities in therange 1-5$\mu$Jy; such radio objects, if unlensed, will only be observableroutinely with the Square Kilometre Array. The observations of HS0810+2554,which is also detected with e-MERLIN, strongly suggest the presence of amini-AGN, with a radio core and milliarcsecond scale jet. The flux densities ofthe lensed images in all but HE0435-1223 are consistent with smooth galaxy lensmodels without the requirement for smaller-scale substructure in the model,although some interesting anomalies are seen between optical and radio fluxdensities. These are probably due to microlensing effects in the optical.

Observations of radio-quiet quasars at 10mas resolution by use of gravitational lensing