Adele sets another record by at the Glastonbury festival, making her set the most-watched Saturday headline performance since 2008 Joern Pollex / getty

Adele led the way as Glastonbury enjoyed an all-time record TV audience of 18.7m over the three days, with her acclaimed Saturday night set attracting 3.7m viewers, the highest for a single set since 2008.

Music Week reported that the festival's TV viewings overall were up 3% over last year – with the British singer among the most popular performances. Adele, who famously suffers from stage fright, performed the most-watched Saturday headline performance since 2008, dethroning Jay Z's Saturday act.

As a result Adele's album 25 is set to leap 13 places up the chart, making her the only serious contender for the top spot this week (1 July).

Meanwhile, Coldplay, who closed the festival on Sunday night (26 June), also broke a record for the number of viewers in a Sunday headline slot. According to Music Week, their performance peaked at 3.4m viewers, with an average of 2.0m.

The band have now headlined at the Somerset festival four times – more than anybody else – with their previous Saturday headline performance in 2011 attracting an average audience of 1.0 million.

Jeff Lynne's ELO became the most-watched act of Sunday's legend slot, pulling in an audience of 2.4m. The legend slot has become one of the biggest highlights of the event. Last year, Lionel Richie took the slot, attracting an average audience of 1.71m.

Friday night headliners Muse didn't go down as well, attracting an average audience of just 346,000 for its live stream on BBC Four and 420,000 when the performance was repeated later on BBC Two, with a one-minute peak of 796,000 at 00.16.