Bandits!

A while back there was a mystyrious unidenfiable burning from under the bonnet. No one knew why. It went away, never happened again. Just put it down to some pine needles or similar. 
Happened again today. 

More thorough immediate investigation revealed some 'crumbs'.   
Crumbs led to the loaf! 
There's been mousey visitors. 
Assuming the lack of driving over lockdown has made this a cosy place for a nibble. No sign of anything nest or wiring damage so fingers crossed a hoover and some traps will solve the problem.