(1) For the purpose of determining contributory negligence -

(a) a plaintiff shall be responsible for the acts of a person for whom he is, in the particular circumstances, vicariously liable;

(b) a plaintiff in an action brought for the benefit of the dependants of a deceased person under Part IV (whether such plaintiff is the personal representative or a dependant of the deceased) shall be deemed to be responsible for the acts of the deceased;

(c) a plaintiff suing as personal representative of the person suffering the damage shall be deemed to be responsible for the acts of such person;

(d) a plaintiff suing on behalf of another (in this section called a nominal plaintiff) shall be deemed to be responsible for the acts of that other (in this section called the beneficiary) and, in particular, a person suing as personal representative of a deceased person shall be deemed to be responsible for the acts of those who would profit by success in the action, including the dependants of the deceased where the action is brought under Part IV: provided that -