Not our finest hour! Planes grounded, thousands of festive holidays ruined, roads ungritted, drivers stranded for hours . . . and all because it snowe

By ARTHUR MARTIN, COLIN FERNANDEZ, RYAN KISIEL, RAY MASSEY and DAVID WILKES Shovelling snow while it's still snowing: Workers at Heathrow try to clear the snow after all flights at the airport were grounded over the weekend Millions of Christmas travellers remained stranded last night, fully 36 hours after heavy snowfall crippled the country.Much of the transport network was paralysed –