Child helmet size XS for scooting, biking etc. (Raynes Park SW20)

Looks in good condition, although likely dropped on the floor a few times by my child, so it comes with no guarantees.
Grown out of. Size is XS (extra small, 46-53cm, normally suitable for pre-school or younger primary school children). Brand is BTWIN.
There's a chin strap with buckle in good condition, some padding on the inside, and an adjustable size system to get a good fit.