I would be very grateful for any material you can refer me to
regarding the circumstances in which a wrongdoer (whether due to tort
or breach of contract etc.) is entitled to have their damages reduced
by reason of benefits conferred by a third party and the circumstances
in which such third party benefits may not be taken into account and
regarding the theoretical underpinnings of this area of the law. Self
Speaking for myself, I don't really see why such reductions ought to
be the rule, rather than the exception.