The number of midges in the north and west Scotland has been falling recently. At the same time midge numbers in Northern Ireland and parts of South West England and Wales have been increasing. However a midge expert said that this was likely to be due to local weather conditions each year rather than a general shift of the insects south as a result of climate change. The BBC reported that Dr Alison Blackwell, from Edinburgh University, said that midge levels down south and in Northern Ireland were unlikely to reach the levels found in parts of Scotland. “Midges need…