Mavis
Sorry for the delay in picking up this query.
Unfortunately there is no name index for the 1841 census so an address is essential for a look up.
Did John have any siblings? If one was born near to 1841 it might be worth getting the certificate so you can get an address.
Alternatively, if you are trying to find his siblings/parents, perhaps you could work backwards from the 1881 census. The earliest census with a full index is the 1861. There are partial indexes for 1851.
If you want a look up in any of the indexed censuses please give as much info as possible eg what you have from the 1881 (including occupation), possible names of parents/siblings, as this will help narrow down the search.
Barbara