Kate, Unfortunately you didn't give locations for either the workhouse or her marriage. You also omitted Henry's birth year. Assuming she was registered with both given names, FreeBMD has only four possibilities. But it's a big assumption. However, you might search those registration areas for an Edward born a couple of years later. I presume you've favoured the Lincolnshire birth, because of proximity to her place of marriage. If so why not order the certificate. Find My past allows searches by occupation. I searched for Henry Williams, teacher or tutor in 1851 without success. There was one in Bath in 1861. It may be coincidental, but worth checking out. If you're convinced of Lincolnshire, have a look for marriages of Henry Williams in the area. Then check the possibility that his wife died before 1861. It could be that she died in childbirth and so Henry put the children in the workhouse. Lots of possibilities. You need to eliminate some of the obvious ones. Peter