This is a very promising lead. Lucy Poulter and William John Gatward were married in Luton on 24/10/1882. Add to this the fact that Edith Jane Gatward, their daughter, was born in Wheathampstead in 1885 and it looks as though this could be the right person. Curiously, the only record I can find for a Lucy Poulter for around 1850 is a Christening in Wheathampstead in 1846. Any comments?