Water companies in the UK are pushing for substantial increases incustomer bills, with some firms seeking hikes of up to 84 per cent over the next five years. Southern Water has requested the highest increase at 84 per cent, while Thames Water, the country’s largest water supplier, is asking for a 53 per cent rise. These proposals come as water firms aim to upgrade their networks and cope with rising energy costs. The potential bill increases are significantly higher than previously suggested by water regulator Ofwat, which had earlier proposed a £94 rise over five years. The news comes as a f…