Mobile ad spending in the UK will reach almost GBP7 billion ($9.45 billion) this year to represent more than a third (36.6%) of UK media ad investment, according to eMarketer's latest UK ad-spending forecast. Overall digital ad spend will grow 11.0% in 2017 to GBP10.89 billion ($14.70 billion), accounting for 57.9% of total media ad spend.