Thanks. Both names are shown on Mary's baptism and I'd hoped they had married around the same area. Mary married Robert Beattie in St Peter's, Liverpool (not RC I think) in 1823 and I think married again to William Dawson in St Nicholas, Liverpool.
Marriage: 29 Sep 1823 St Peter, Liverpool, Lancashire, England
Robert Beaty - Bricklayer, the Parish of Liverpool
Mary Fitzgerald - (X), Spinster, same Parish
Witness: Edw. Parr; Robert Johnson
Married by Banns by: T. Kidd, Curate
Register: Marriages 1821 - 1823, Page 252, Entry 290
Source: LDS Film 93917
..............................................................................
Baptism: 31 May 1829 St Peter, Liverpool, Lancashire, England
Margaret Beaty - [Child] of Robert Beaty & Mary
Abode: Dawson Street
Occupation: Bricklayer
Baptised by: William Tyrer, Offg. Minister
Register: Baptisms 1828 - 1829, Page 339, Entry 2709
Source: LDS Film 93877
...........................................................................
just to let you know both records are spelt Beaty...