Wales has hosted the British round of the World Rally Championship since  2000, first in Cardiff and now in north Wales. But this October’s event could be the last for a few years at least with plans for a rotation system, starting in Northern Ireland next year. Here Dai Sport’s rallying expert, Paul Evans, looks at the reasons why it could be moved, including Phytophthora ramorum the unstoppable Larch tree killing disease threating the forests in north Wales.