8.3m people in the UK watched England win the Cricket World Cup

"Sky and Channel 4’s shared FTA coverage of the Cricket World Cup final on July 14th – which saw England beat New Zealand in the competition’s first ever ‘super over’ – drew a combined TV audience of 8.3 million.
Sky’s Chief Executive UK and Ireland Stephen van Rooyen said: “Congratulations to England and everyone who has been part of the journey at the ECB. The ICC put on a terrific tournament. We’ve been proud host broadcasters of a home cricket World Cup, dedicating a channel and showing every single minute, which has been absorbing from the first ball to the unforgettable final delivery. Sunday saw a peak across Sky and Channel 4 of 8.3 million – a huge audience for a huge moment for British sport. On Sky’s channels our peak was 3.5 million alone, a fitting way to cap a terrific tournament.”"
Source:  Advanced Television, 15th July 2019