I have a file on the Bagnalls that is mostly based on personal research and research completed by a 2nd cousin(?) from a family book "A family Tapestry". Its written by Eva Plewman Appleton. It covers the Bagnall, Plewman and Rothwell families for the most part and goes back to 1420 (roughly). It covers Bagnalls from Ireland mainly that migrated to the US, Canada, S. Africa and I believe New Zealand. I will eventually have to make adjustments (I think) for the S. Africa and New Zealand extensions but have the Canadian and US names.
I'd be happy to send it to you, I would just need your e-mail address. It is in a uzed format right now, am trying to convert it to a full gencom file.