Pure economic loss caused by a negligent act: power cut damages calculation (Spartan Steel)

In Spartan Steel and Alloys Ltd v Martin & Co (Contractors) Ltd [1972] EWCA Civ 3, where contractors negligently cut a power cable to a factory, the majority of the Court of Appeal held that the claimant could recover for physical damage to its property and for economic loss consequential on that physical damage, but not for pure economic loss independent of any physical damage. Applying that rule, Forgewell recovers the £1,200 physical damage to the batch in the furnace and the £900 profit lost on that same damaged batch, which flows directly from the physical damage. The £4,500 profit on batches that could not be started is pure economic loss caused only by the interruption of supply, independent of any damage to Forgewell's property, and is not recoverable. The total is £1,200 + £900 = £2,100.

Why A is wrong: £6,600 wrongly includes the £4,500 profit on new batches, which is pure economic loss unconnected with physical damage.

Why B is wrong: £1,200 omits the £900 lost profit on the damaged batch, which is consequential on physical damage and recoverable.

Why C is wrong: £5,700 adds the pure economic loss of £4,500 to the physical damage while leaving out the consequential loss of profit.

Why E is wrong: The ruined batch is physical damage to Forgewell's property, and the profit lost on that batch is consequential on it, so both are recoverable.