Hi Ponti
It is a tricky name isn't it? I was confused at first because the marriage record you quoted has wife Ann, and the census records I came up with at first had wife Mary.
I suppose you have what looks to be Benjamin's second marriage to Mary -
Jul/Sep 1849 Pontefract 22 349
Benjamin Hessom/Mary Ann Lockwood
As to his birth record, according to Genuki Pollington is in Snaith parish. I looked through the relevant batch going into the IGI from the Hugh Wallis site, but no Essom/Hessom/Easom/Eyesome or any other possible variant that I could see.
BUT there is something strange about the batch. There don't seem to be any boys after about 1775, and of the 40 odd baptisms between 1800 and 1812 or so all are definitely girls! It's probably worth checking the parish records or asking for a look-up. Sorry, I can't help with that as I am in the south of England.
Anne