Emotive language ("all the heart" x2) start and end of speech repetition emphasises his emotional tie to the issue. Use of common idioms of the lower classes to evoke pathos + appeal to their emotions.
Emotive language ("the woman I love") plain and simplistic lexis emphasises his humanity and the simpleness of the reason for his abdication. The lack of naming Wallis is due to the controversial government opinion of her, and this speech would have been vetted by advisors so it would have been suggested to not name her due to the controversy surrounding her.
Repetition ("mine and mine alone") shows that Edward is trying to hold all accountability for his decision, as it would be likely that tabloids would claim that Wallis made him do this.
The almost tautology "mine alone" acts as intensifying phrase to further emphasises point of holding himself accountable for his abdication.
Lexis and monarchy - "constitutional crisis" "throne" "minister of the crown" "Prince of Wales" "Duke of York" "King and Emperor" - emphasises his place in society, making his use of plain lexis in other places appear incongruous. This emphasises the split between him and his listeners, even if it is done in advertently, making it appear his attempts to appeal to the general public are fruitless due to his place in society.
Lexis of Duty ("declare my allegiance", "discharged my last duty") stresses the societal importance of the crown and the tradition that surrounds it. He is inadvertently emphasising his own personal sacrifice of stepping down and shaking of his duty.
Opener ("at long last I am able to be say a few words of my own") foregrounds the notion that there words are coming from him. As he goes to such great lengths to do this it is clear he wants to take all responsibility for this issue. The elongated vowel sounds of this phrase at the start and end slow down this phrase and places emphasis on "my own" to emphasise this point further.
Edward's closing statement ("God bless you all! God save the King!") - the change here with the use of the exclamative shows Edward's looking positively to the future, suggesting that the listeners should also do this.
Grice's maxims - fits the criteria of maxim of quality but flouts the maxim of relevance as he does not always stick to the point at hand, his abdication, when he tries to appeal to the listener's emotions.
Through applying Gile's accomodationg theory you can see he is trying to converge his language to those listeners, who are of lower class to him, to evoke Pathos.