LONDON (Reuters) – Britain said it plans to spend 300 million pounds ($380 million) on a new programme to produce advanced nuclear fuel suitable for the next generation of power-generating reactors, seeking to dislodge Russia as the main international supplier. Britain was one of over 20 countries – including the United States, France and South Korea – that recently signed a pledge to triple global nuclear capacity by 2050 as part of international efforts to cut climate-damaging carbon emissions. On Sunday, Britain said its new investment would help support domestic production of high-assay lo…