(Reuters) -Britain blocked a proposed merger between Finnish industrial machinery firms Cargotec and Konecranes Abp on Tuesday, after its competition watchdog found “substantial” competition concerns. Britain’s Competition and Markets Authority (CMA) said its in-depth probe found the 4.5-billion-euro ($4.95 billion) merger would harm competition in the supply of many container handling products. Konecranes and Cargotec, which announced a merger of equals in October 2020, compete closely in the UK. “This loss of competition could have serious consequences for UK port terminals and other custome…