As Welcome as the Flowers in May, published by Metzler actually credits Rowley as having sung it, but his name doesn't appear on any of the Hopwood and Crew covers I've seen. The other singer who crops up a lot is Fred French.
I think the editor of Era has got the wrong date on 'Paddle' unless there was an earlier edition. The serial number fits in the 1866 bracket which is the date given by the Era in the contemporary mention.
These early references prior to 1860 are very interesting. We know very little about this period. The Music Hall was just in its infancy then.

I think it says somewhere in the thread earlier on that Fanny emigrated to America in about 1889.