Many thanks to those that replied. A blown 40 amp fuse has been discovered together with low leisure battery voltage as predicted in the posts. Matter now resolved . Radio and central locking worked immediately and management light extinguished after approx.15 mile journey on the road. Again ...

We have acquired a 2003 Bongo a few months back. Very impressed. However of late and over the space of a couple of days, the radio has failed to show any signs of life, the vehicle locking system cannot be locked /unlocked by use of the remote key fob ( although activates manually using the key) and ...