Thank you. My wife was offshore.
PCC, PTE or English ability, medicals, joint bank statements, photos of marriage and photos with friends and family, call records, whatsapp conversations, facebook status, statutary declaration from wife's parents and my parents, a hand written letter by you and your wife ( how you met and how relationship developed), joint bills, flight tickets, hotel bookings, train tickets, anything which has you and your wife's name :).
All the best.
dont wait for co to ask. upload everything.