'tis true , ....for all the disbelievers out there....
" B747 G-**** LHR-CWL CRUISE
50 tonnes of fuel dumped during positioning flight to Cardiff
The flight was a positioning flight which departed late and the crew were trying to beat the jet ban. Dispatch passed a message stating the aircraft was approx 6 tonnes too heavy to land in Cardiff. The flight departed and the figures were re-checked and it was discovered that the aircraft was 50 tonnes too heavy. The situation was discussed with Flight Tech Dispatch and the Ops Control manager gave permission to dump fuel down to safe level .
50 tonnes of fuel jettisoned. "