See middle slide on page 5 on this document. http://www.rospa.com/roadsafety/conf...dings/lang.pdf

I think this is saying that the weight restriction of the child seat (CRS) is 15kg. The other weight restriction referrring to the child itself will be dependeant on the make and model of the seat, I don't think that will be restricted to 18kg.

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Fastbuck
2009 F01 7 Series 3.0D SE Saphire Black/ Oyster
2008 E83 X3 2.0D SE Montego Blue/ Black
2007 E70 X5 3.0D SE Space Grey/ Beige - SOLD
2006 Land Rover Freelander Sport TD4 Zambezi Silver/Black - SOLD
2005 W203 C200K Sports Coupe Jasper Blue/Artico Black - SOLD
2004 W211 E320 CDI Avantgarde Brilliant Silver/Alpaca Grey - SOLD
2001 E39 530i SE Crystal Green/ Beige - SOLD