well i had saf leather in my xr4x4 and that wasnt latch into place
only probs i had was when i had to brake hard the back seat would fly down
the only solution i thought was to take the brackets off the hatch seats and weld them onto the saf back seat so it would lock in place but didnt know how to strip the back seat down then so never bothered
mot was fine aswell
as they only check back seat belts not the seat