We propose to undertake a survey of the far-infrared and sub-mm properties of a well defined sample of 24 low-redshift, radio-loud, AGN. Our primary objective is to trace the smooth flat-spectrum synchrotron radio emission into the infrared, and beyond, using observations made with a combination of ISOPHOT and SCUBA on JCMT. We will also obtain information about the amounts of warm dust, and its temperature, in different types of AGN. The results will provide unique observational constraints on emission models, on the classification of different types of AGN and upon unified schemes. The radio sample consists of all radio-loud, core-dominated, AGN stronger than 200mJy at 5Ghz with declinations >+20 and with redshifts <0.07, excluding broadline objects. The targets are roughly divided between BL Lac objects and apparently normal radio ellipticals. We plan to observe them at wavelengths of 25, 60, 90, & 160 micron.