Literate Funny from The Dark One

Mr. York's pub was losing custom. Young locals wanted somewhere to have a
dance & a DJ but he had no room. So he bought an ex-army marquee and put it
on the car park. It was a great success but business tailed off in the cold
weather. His son was an art student so they put in a patio heater and son
painted a mural of tropical seaside scenes on the canvas. When the
customers saw the result they said:

(wait for it!)

"Now is the winter of our disco tent made glorious summer by this son of
York".