Contract - Under-registration of electricity consumption - Disconnection of electricity claimant commencing action against defendant for breach of contract and defamation - Claimant suffering loss resulting from rewiring of premises - Claimant contending defendant’s breach of duty caused loss - Whether defendant breached duty - Whether breach caused loss - Whether claimant entitled to damages for physical inconvenience and mental distress - Whether defendant entitled to payment for under- Registered consumption - Assessment of damages.