As usual it's appeared within an easy distance by landrover of the Royal Agricultural College at Cirencester.
It's a stylised form of communication between generations of farmers; the students who perpetrate crop art now will be the victims of crop art in the future.
What's more, I see at most 5% of the claimed 250m x 60m area flattened, in that photo. Or 750m2 of lost arable: it's utterly inconceivable that the damage could be £600,000. That's 800 quid the square metre.
Looked at another way, in England wheat yields 8 tonnes / hectare at a wholesale price of up to £200 / tonne. If the whole rectangle around it couldn't be harvested, that would be a loss of no more than £2400; but 95% of the crop is still standing, so the true damage shouldn't be more than £120.