My recollection is that Stan Hugill said he had heard people pronounce it both ways, but I might be quite wrong. My own impression is that saying Rye-O gives a faint whiff of schoolmasterly snobbishness, a sort of "Hey, I've researched this and I know this is how the old-timers sung it". It may be fine for the aficioados, buit I think Ree-O is more user friendly singing to Joe Public.

But to return to the thread topic, the Young'Uns are terrific. I was so impressed by them on first hearing that I made the very strongest recommendation to Shrewsbury Folk Festival that they should be booked. My advice, alas, is not much valued in folk circles. I fear the group may well become the Old'Uns before the generality of the folk mainstream get round to taking an interest.