Britax Rock a Tot- can you buy a replacement newborn insert?

[Haylstones]

I'm due in 10 days [gulp] and have got dd's rock a tot car seat all ready but we can't find the newborn head insert for it anywhere (we've moved house...say no more). I can't find anywhere that sells the head bit separately- does anybody know if it's possible to get one? I could dow ithout having to replace the whole thing!
TIA

from mothercare babies rus they aren't much to buy

www.mothercare.com/gp/product/B000TGK6PY/sr=1-8/qid=1202905195/ref=sr_1_8?ie=UTF8&m=A2LBKNDJ2KZUGQ&n =42835041&mcb=core

Have you phoned Britax? They might send you one for free. Recaro did when we lost the crotch pad.

www.toysrus.co.uk/Product.aspx/bruhome/brutravel/brutravelcarseats/brutravelcarseatsaccessories/2130 20

Incredibly, I hadn't even thought of contacting britax . I'm going to do that right now, if no joy the MOthercare one might work...
Why do I always leave things to the last minute??