I noticed that Henry's brother, John, baptised at All Saints on 13th August 1803 was living next door but one to Henry in 1851. His birth place is All Saints, the correct transcription of Alcess.
The first baptism for the family is William in 1801, although there may have been Fanny in 1797, entered as Lewit. The baptisms were in the adjoining parish of St Margaret's, but I can't find a marriage for John and Elizabeth.
David.