I've just stumbled on this website which I haven't seen mentioned before The Child Ballads Project which lists recordings of individual ballads. It includes source singers and revival singers without any distinction. There is no discography attached though many of the recordings will be familiar. It doesn't say who has compiled the list of recordings - Sandy Paton is the only name given, along with the address of his Folk Legacy site, but Folkphile and requiem are also credited as contributors. There are almost inevitably some omissions, but on the whole the site seems farly comprehensive. It seems quite a useful source.

It looks like somebody has done a lot of hard work for which they deserve congratulations.