In the last few months I've been on a mission to find new places to dip on Dartmoor. It's because my pal Matt Newbury and I have been commissioned to write a book about the Moor's amazing swimming places. There have been a few disappointments and false dawns along the way. Like the lovely looking blue spot on the map which was indeed a pool, but was surrounded by slurry and also had a dead sheep in it. But in recent weeks we've had some successes.