A poll of 2,000 adults found the younger generations have nearly six-and-a-half hours each day to put towards things they enjoy. Whereas those born between 1965 and 1980 have less than five hours.

It emerged London is the ‘smiliest’ region, where residents grin for more than an hour a day. Compared to the rest of the South East – where they smile for just 43 minutes.

The research was commissioned by Nutella to mark its 60th anniversary and the opening of its Smile Café, in Greek Street…