I did a couple of fell races up on Dartmoor during the summer and loved them! I'll definitely do more next year. I'd like to do some proper northern ones but it's a bit of a trek from Devon! At least I have Dartmoor just a few miles away
Seren - I said deer in my post, but in reality quite a few, much smaller animals have made me jump too. The worst might actually be pheasants who come flapping out of the hedges screeching their alarm call at you. Far scarier than a hypothetical weirdo who has been hanging out in the woods for hours on end just in case some defenceless female comes trotting past!
It's never even crossed my mind to carry a personal alarm! The majority of my runs are off road through fields and woods where I feel a lot safer than running in cities. Normally the only I time I get a fright is if I'm running at night and a deer jumps out in front of me!