According to the presumptions in the Sexual Offences Act 2003, is there rape in the following situations?

(a) Donald and Vera had sexual intercourse. Donald had promised her money for doing so, but left without paying.

(b) Donald tricks Wendy into having sexual intercourse with him by pretending to be George Clouseau, a famous film actor.

(c) Donald, who is happily married to Xenia, comes home to find her asleep and starts having sexual intercourse with her. She wakes up and tells him to stop.

(d) In a bar, Donald buys Yvonne an alcoholic cocktail rather than the non-alcoholic drink she asked for. Yvonne does not notice the difference and, not being used to alcohol, becomes drunk. Donald drives Yvonne back to her flat where they have sexual intercourse.