Idiot that I am that link to Moor & Coast festival is for the wrong end of May, sorry.

One alternative is Cleethorpes Folk Festival, which might suit. I enjoyed living there, but have to admit that it isn't the same draw for folkies or non-folkies as a trip to Whitby would be.

I think we may be reading too much into the name Severn, which has been in use for at least 10 months. Maybe Severn could enlighten us?