A Ford Anglia with a fist-sized rusty hole in the front wing and no tax or MOT, a Vauxhall Viva with a self-healing cylinder head gasket and a mechanic who is paid to fix cars quicker than the manufacturer says is possible. What could go wrong? This is the life and times of car mechanic Brian Cunningham in the 1970s and '80s, when fixing a car was one thing, and it staying fixed was something else entirely! Packed with nostalgia and revelling in the forgotten details of a bygone age when cars were simpler (though more dangerous by far!), Under the Bonnet reveals how the cars worked, how they got fixed and the many secret scams of the motor trade.