Don't touch it! Electricity doesn't take idiots lightly.
Buy a new one
October 2016
Miles Tools & Machinery has exploded parts diagrams of Qualcast mowers - mtmc.co.uk
The switch assembly appears to be fixed on with two screws onto the push handle - from below.
It's very doubtful that you'll find a lose wire - more likely a failing switch or some other bad connection in the power cable - perhaps at the plug end.
Good Luck...
October 2016
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