Hi Roger
Thanks again for your help.
My Bridget Rider's father is definitely Bartholomew (Bartly or Batty) as I have her marriage certificate which gives her father's name as Batty. It is possible this other family of Thomas is related as they come from the same area.
I have a baptism which may be my Bridget for 8 September 1853 (birth 5 Sep 1953) father Batty Ryder and mother Bridget Callaghan in Backs, Mayo: address Tonebeha. This makes her older than she claimed to be in censuses etc in England but the names fit. Witnesses were Peter Ryder and Bridget Gaughan. In the censuses Bridget Ryder (Rider)'s birth place is recorded as Tonybaun or, in another, Attymass (recorded as Abbeymass) which was possibly her husband's home parish.
Alison.