David Murray still recalls why he wanted to swap shifts during his school holiday job as aButlins porter in a holiday camp in Ayr.

"You relied on tips," explains the Scottish metals, property and football entrepreneur. "If you worked in the mornings, you'd go to the chalets and people would say: 'Sorry, son - we've nae money left.' But if you worked in the afternoons, they would all be arriving off the trains and the odd 10 shilling note didn't go amiss."