Coffee brakes

So scientists have created biofuel from ground coffee (your report, 17 June)?

Does this mean we’ll soon have thousands of cars dashing about the place and making rash decisions, then struggling to change into neutral gear in the evening when they’ve had too much?

And as the American chains cash in on the trend, will it take ten minutes to explain your fuel order to the over-qualified garage attendant?

JASON GRAEME

Edinburgh