On TC's recommendation I tracked down a second hand copy of "Exploring Lakeland Tarns" by Don Blair ("tracked down" in the sense of typing it into Google and finding a copy on Amazon

) Absolutely crammed full of such info, brilliant

. Of course the problem with discussing all the little hidden secrets in full view would mean they wouldn't be hidden secrets any more

Can't contribute much myself I'm afraid as I haven't got to grips with them yet - just some of the rivers and a few of the Lakes. Now my lad's a bit older though I might pack the tent and do a hill walk/tarn-fish/camp out thing with him this summer, we'll see.