Thanks, David. The info about Harrowden and Cardington is helpful (on the censuses there are various different transcriptions of what seems to be these two places so that makes sense).
I'm sorry you think I am being unrealistic. I have the birth, marriage and death indexes for Cambs so I thought someone might have the same for Beds and could, therefore, check that name against the index to see if anything came up around this date which could establish the correct parish and, therefore, help narrow down my search.
Tara