In theory, you don't. However, because of increased security in recent years, airlines won't allow passengers to fly without acceptable photo I.D. A valid passport is the most acceptable form of I.D.
No. Both locations are in the U.K., and thus, do not require a passport.
yes you do in order to travel you must have a passport
jersey as in new jersey or as in england? yes you need passport for both.
yes
Yes without a doubt you do
No
do I need a passport to travel from south wales UK to jersey
no you dont
Not unless you need a passport to visit Weymouth.
No but you do need I.D.
If you have a French Passport, you might require a US visa to travel to Jersey.
No.
Yes, you do need your passport.