In reply to sam@work:
I've been up on the high north-facing crags 'til fairly late on and it's been absolutely fine. The only real problems I've had this year have been some mozzy bites on a hot day's walking, and after clambering through the horizontal forest of felled trees for hours and hours at the most notoriously tick-ridden crag in the country, with no repellent or protection, I got covered in ticks. Which was f*cking grim.