On September 15, 1973 The Who performed their first single from the forthcoming Quadrophenia. The announcer is wrong when he says this is the band's first single in two years. "Join Together" went top 10 in 1972. "5:15" would peak at #20 in the UK charts.
To celebrate the release of the Directors cut of Quadrophenia in 2011, The Who held a worldwide "5:15 video" contest. Here's a to link to the winning entry by Jeff Rodenberg.
Here's the "5:15" B side: "Water", recorded in 1970.
And the band's infamous interview that year with Russell Harty