In reply to toad:
> I think i might have asked this before but why can't humans use a Frontline/ fipronil type product?
They can - in The US there are several products made by Sawyer that can be washed/sprayed onto clothing. It works really well 'n all.
I'm surprised they were bad at Bosi - they tend to like overgrown shady places like woodland. Maybe on the approach? They're all over Avon Gorge at the minute as well. I flicked at least 8 off myself while belaying a single pitch on Unknown Buttress the other day.