Which subject line strategy will make 6% more of your customers click on Black Friday? We look at top performers from 85 million email sends

Black Friday is undisputedly big business for retailers, with UK online sales topping £1 billion for the first time in 2015. And email advertising was the single biggest channel driver of Black Friday online sales, generating a massive 25.1%, or £251 million, according to a report by Custora.

Given that Black Friday UK online sales increased 35% in 2015, and that 2016 is widely predicted to see even greater growth, email looks set to drive an estimated £338 million UK online sales on Black Friday, 25th November 2016. Not a figure advertisers would want to ignore.