By James Davey ROYDON, England (Reuters) – In a small corner of south-east England, vast glasshouses stand empty, the soaring cost of energy preventing their owner from using heat to grow cucumbers for the British market. Elsewhere in the country growers have also failed to plant peppers, aubergines and tomatoes after a surge in natural gas prices late last year was exacerbated by Russia’s invasion of Ukraine, making the crops economically unviable. The hit to UK farms, which need gas to counter the country’s inclement weather, is one of the myriad ways the energy crisis and invasion have hit …