Whurring sound from fusebox

Hi, this morning there was a strange whurring should from the fuse box. We tried a couple of the switches but it only stopped when we shut off the main switch. Nothing is plugged in or running apart from the fridge / freezer (washing machine / dryer / tv etc all turned off)
Have a freezer full of food so not keen on leaving the power off altogether but obviously safety is more important! Any ideas? Thanks!

Totally unprofessional/novice answer but are there fuses or trip switches? If fuses would one of them be slightly loose and placing a strain on it?

just checked again and the light/heating switch seems to stop it. I presume we should keep this off?

oops, its the trip switches in the fuse box

Is the electric meter mounted in the fuse board as this can make the sound you discribe. Also could be a night saver clock in or beside the meter.

Not being smart bud but I have seen too many electrical fires in my time. This sound could be anything from a loose connection to a poorly mounted switch. I would be enclinded to call a reputable Electrician at this stage to ask his opinion. Could be the best fifty Euro you ever spend!