They stole the show at the opening ceremony of Glasgow's Commonwealth Games.

And now the makers of the world-famous Tunnock's teacakes say sales have soared since last summer - and they are struggling to keep up with demand.

The Uddingston family-run company sold an extra 15 million of the part-biscuit, part-mallow treat in the year after the Games.

The figure takes Tunnock's to a record turnover, which has almost doubled in the space of five years.

Bosses have invested in new machinery to increase production, and tours of its factory are fully booked until 2017.

Fergus Loudon, operations director with the firm, said that the opening ceremony had been pivotal in improving sales.

Mr Loudon said: "The Games organisers contacted me last February and asked if we would be happy with them using our brand, but I had no idea what they were planning.

"When we sat down to watch the opening ceremony we were absolutely flabbergasted.

"After that the phones started ringing off the hook. There was an enormous worldwide spike in the demand for teacakes."

The ceremony at Celtic Park was watched by ten million television viewers in Britain, as well as one billion worldwide.