The start of Britain's new electricity trading arrangements has been delayed until at least March 27, 2001. The delay comes as no surprise to many in the electricity industry who have observed the software problems being experienced in the run up to the planned "go live" date of November 17. These delayed the start of four weeks of end-to-end testing -- the final simulation before go live which involves 11 participants and will test that all the systems work together satisfactorily. According to energy regulator Ofgem, the final problem to be resolved before end-to-end testing is the inability to complete communication and file transfer tests between participants and central systems. Until this is sorted, it is difficult to work out a revised time scale, says Ofgem.