Just two years ago, U+I, the listed British property developer and investor, was hatching plans to invest €500 million in Dublin. Matthew Weiner, a 20-year veteran with the company, which was previously called Development Securities, was back and forth regularly to the capital as his company sought regeneration projects in Dublin 2, 4 and 8. Dublin, he said, was “bristling” with opportunity. For a period, his company was almost omnipresent – at one stage, it offered to refinance all of one the developer Johnny Ronan’s personal property portfolio out of Nama, while it was also in the running to lead…