Left: A1451 GMRT 320 MHz full (green) and low (black) resolution contours superimposed on the X-ray XMM-Newton image. Low-resolution contour levels (black) are (2,3,4,8,16,32 ...) × σ with rms noise σ = 0.3 mJy/beam and beam = 39.4′′ × 27.9′′. Full-resolution contours start at 0.3 mJy/beam and are spaced by a factor 2. The full-resolution beam is 11.6′′ × 8.1′′ The first negative contours are dashed. Right: JVLA B array contours (red) of the central part of the cluster superimposed on the optical DSS image. Sources are labelled A to D as in Fig. 3. Contours start at 0.08 mJy/ beam and are spaced by a factor 2. The beam is 4.7′′ × 3.3′′. The first negative contour is shown with a cyan dashed line.