ITV's BGT had an average audience of 10.9 million (including viewers of the catch-up +1 channel) to land its series high.
The show was up one million on the equivalent programme last year.
But it was at the expense of BBC1's The Voice, which was 600,000 down on the previous week with an average of 7.4 million viewers for the first battle round of the series.
And it was a colossal drop of almost four million on the first battle round in 2012 which had an audience of 11.2 million.
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