It's worth noting that a lot of American ads (aka "adverts") use British accents. This is probably because Americans consider RP English to be educated, authoritative, and cultured. read more
Thirty-five percent of Americans say that British accents are appealing, while only 11% of British people say that American accents are appealing, according to a 2014 study by YouGov, a London-based market research firm. read more