I feel a little uncomfortable starting such a thread myself (rather blowing one's own trumpet) but if you want to start one I'll gladly contribute. I will be offline for a while from Monday but I will gladly put lists up with Roud numbers. It would take me too long to list all of the sources and their titles on broadsides but I could easily list the folk songs as they are now. The Child ballads are almost all well documented in Child anyway.
The A list is fairly short though the B list is quite long. It is the A list I will be presenting at the TSF meeting at C# House on the 14th. I haven't started copying the images of the B list yet. I hope to have this done by the TSF meeting at Sheffield in June.

I have Excel spreadsheets of the 3 lists but I don't know how they would copy to Mudcat format.

I ought to also add that the project is only based on folk songs found in oral tradition in England and therefore doesn't cover Scotland, Ireland or America where there are such songs from 17th century English broadsides.