PEUGEOT 308 Handbook page 214

Safety
U : seat suitable for the installation of a child
seat secured using the seat belt and
universally approved "rearward facing" and/
or "forward facing".
U(R) : as for U , the vehicle seat must be
adjusted to the lowest position with
11 operations of the seat height adjuster
and intermediate longitudinal position.
X : seat not suitable for the installation of a child
seat of the weight group indicated.
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(a) universal child seat: child seat which can be
installed in all vehicles using the seat belt.
(b) group 0: from birth to 10 kg. Infant car seats
and "car cots" cannot be installed on the
front passenger seat.
(c) consult the legislation in force in your
country before installing your child on this
seat.
(d) to install a child seat on a rear seat,
rearward or forward facing, move the front
seat forward, then straighten the backrest to
allow enough room for the child seat and the
child's legs.
(1) a child seat with support leg must never be
installed on the centre rear passenger seat.
Remove and stow the head restraint
before fitting a child seat with a
backrest to a passenger seat.
Refit the head restraint when the child
seat is removed.