In some ways, the most interesting element of Ireland’s new tax-incentivised investment scheme was not announced on Monday. It remains unclear how much investors will be able to put into these new savings and investment accounts when they come into play next year. That tantalising detail, which will largely determine the success of the new accounts, has been saved by Minister for Finance Simon Harris for budget day. But there were elements of the Tánaiste’s Monday announcement on retail investment that gave some real hints as to what the new accounts would look like.  Since the Government has committed to…