In 2016, the UK spent a higher proportion of its Gross Domestic Product (GDP) on advertising than any of the major international economies, according to the WARC International Ad Forecast.
For 2015, it was estimated that for every man, woman and child in the UK, £308.56 was spent on advertising. (Source: http://adassoc.org.uk/news/uk-advertising-spend-passes-20bn-as-growth-hits-five-year-high/)
Only Australia – and this was several years ago – seems to have historically compared with the UK for its ad spend to GPD ratio. Currently, the closest markets for ad spend to GDP ratio are the US, Australia, Japan, Brazil and Canada.