i need rear headrests on my Clio mk3

Apologies if this has already been answered...

I have a 2010 Clio 3 door 1.2 extreme. It has no rear headrests yet i can feel through the cloth, slots for them i believe. Is it headrest holes I am feeling and if so, can I buy headrests in the UK to fit the car? I guess I would have to cut holes in the seat tops though.

NOTE: this is pureky down to the safety of my kids in the back, not aestetics!!

Any help appreciated