The 2nd of 3 short videos showing how American actors can do a British accent convincingly, from New York acting-coach, John Windsor-Cunningham. Here giving words with pauses for 'you' to repeat them. Dozens more free videos are on his website Windsor-Cunningham.com, and more due in 2024.
(One of the things which I teach when coaching people on their accents is to just watch my video VOCAL COACH - on my website or YouTube, - which solves a problem which is PART of most accents.