new report says 41 million metric tonnes of electronic waste worth a staggering £ 34billion was discarded in 2014 .
countries illegally export ` millions of tonnes ' of e-waste annually to african nations like ghana , campaigners say .
shocking photographs from its capital accra show thousands of discarded appliances in huge , filthy landfill sites .
some contain toxic materials like lead and mercury which damage environment and people sifting through them .