Bit of a long shot but... the couple were married in 53..the registration district come under Wem, Shropshire
Running a search for John snrs death between 41 and 53, there is only one death registered in the disctric of Wem:
June 1844 wem&c volume 18 page 155.
It might, out of desperation be worth having a look.. as there may be his occupation on there and the name of the informant.
If he was a tailor I would be 99.9% it was the right chap and if the informant was his wife that would clear which of the 2 we were looking at...or maybe another child was the informant??
Maybe you could order it stating you only want it if the deceased was a tailor..I'm sure (correct me if im wrong) that if you stated that and he wasnt they wont charge you..