Sexual Offences Act 1956
Lack of consent may be demonstrated by:
The complainant's assertion of force or threats;
Evidence that by reason of drink, drugs, sleep, age or mental disability the complainant was unaware of what was occurring and/ or incapable of giving valid consent; or
Evidence that the complainant was deceived as to the identity of the person with whom (s)he had intercourse.
"What about Yvonne McGruder? That was a date."
"She'd been hit on the head by a winch. She had concussion."
"She was crazy about me."
"She called you Norman."
"She went to bed with me."
"Yeah, because she thought you were somebody else."
"Serves her right for being concussed, doesn't it?"