We present continuum observations of a small sample of high-redshift, radio-loud AGN (radio galaxies and quasars) aimed at the detection of thermal emission from dust. Seven AGN were observed with IRAM and SEST at 1.25mm; two of them, the radio galaxies 1243+036 (z ∼ 3.6) and MG1019+0535 (z ∼ 2.8) were also observed at 0.8mm with the JCMT submillimetre telescope. Additional VLA observations wer...