Following protests last week by the Jamaican government, the UK intervention board has decided to reverse a previous decision to deny a licence to a Jamaican banana exporter.   The board, which supervises the implementation of the EU's Common Agricultural Policy (CAP), had refused the licence in a bid to bring trade relations between UK, the EU and former colonies in line with the rest of the world. A dispute over the preferential EU and UK market access enjoyed by former colonies ended last month, when importers agreed to grant licences based only on past trading volumes.