Thought I'd share this before the autumn school holidays start proper. Got three mates together, hired a cottage near Haworth on the Yorkshire moors for Halloween weekend. Brilliant idea, we thought. Go looking for evidence, spend the night out with thermal cameras and audio recorders.
What we didn't expect: actual locals telling us afterwards that people don't just "wander around the moors at night" for a reason. We had something follow us for the better part of two hours. Not aggressive, just... present. Sounds in the bracken, moving parallel to us about 50 metres off. Our thermal camera died (completely drained battery, which doesn't make sense because we'd only fitted new ones). The audio recorder filled with this low frequency rumbling that made your teeth ache.
Anyway, we got back to the cottage at about 11pm and didn't venture out again. Nobody slept. My mate Keith still won't talk about what he saw near the stone circle.
So if you're planning to do something similar this autumn - fair play, but maybe hire a guide who actually knows the moors? Locals know something we don't.