Hi Cat,
Firstly, if you go to the Sussex Family History Groups site,
http://www.sfhg.org.uk/newmap_of_parishes.htmlYou will get a printable map of Sussex parishes. I printed all the sections out then carefully stuck them together to get a full picture of all of Sussex.
The parishes you are researching in are in EAST sussex. On that note, Burwash, Salehurst & Etchingham are all in the registration district of TICEHURST.
Looking at the 1851 census for the family;
Oasthouse Cottage, Burwash
Joseph Bishop 28 ag lab b. Etchingham
Mary 32 ditto
THOMAS 6 ditto (1845)
Edward Bishop wid 56 ag lab b. Salehurst.
I would take the age of Thomas as about correct on this census as his parents would be more likely to know & give the correct information. The younger they are the more likely the age is going to be right.
There is an extracted baptismal record on familysearch for THOMAS GEORGE Bishop, 28/2/1844, Etchingham.
It doesn't give a relationship for Edward to Joseph. As it's not his father (see below) it could be an uncle.
So far so good. The marriage of Joseph Bishop, Ticehurst reg. district, Q3 1843 (7 581) also has Mary NEWICK on the same page.
Taking it back even further for the parents of Joseph, I found the only likely candidate;
1841 - Dorset St. Kemptown, Brightelmstone (old name for Brighton) HO107/1123/4/11/15
Isabella Bishop 55 Fisherwoman
JOSEPH 20
Mary 15
Isabella 15
Thomas 10
All born Sussex (ages rounded down)
It's very likely that Isabella's husband was out on the high seas earning a living on the night of the census, so to identify him I looked on the SMI...his name was Benjamin
Brighton, East Sussex, 13 Mar 1803:
Benjamin BISHOP, bach
Isabel PAIN, sp botp (B)
I'll look for Thomas George on the 1861 & 1871 later unless someone gets there first , but I think I did spot him yesterday. He wouldn't have been on his honeymoon as he married later in that year & the census was taken in April so he should be a single man.
Hope I haven't forgotten anything & that sorts things out a bit
jane