Sir Martin Sorrell has signalled a major summer surge for Britain’s economy by declaring that the advertising market is the strongest he has seen it in his 45 years in business. 
The marketing guru predicted the ‘ridiculous’ growth in advertising spending by companies seen as a key bellwether for the wider economy may well continue for the rest of the year and into 2022. 
His comments are likely to be seized on by investors in his digital marketing specialist S4 Capital and shareholders in WPP,…

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