Hi Sue,
The IGI has a christening of Susan Starling on 09 FEB 1817 at Broxbourne, Hertford;
parents listed as Edward Starling & Mary Ann.
with Wormley being just south of Broxbourne (on the A1170) - this might be your family

Other Starling christenings to parents Edward & Mary
Edward 28 FEB 1813
Mary Elizabeth 15 OCT 1815
Robert 09 FEB 1817
+ there is a marriage of Edward Starling to Mary Patrick on 27 FEB 1819 at Broxbourne, Hertford - but the date is after children's christenings so may not be the one.
regards John