I bought a new Britax Freeway for £70 for my Golf, then changed my car. According to the staff at Babies R Us this should fit my car but it doesn't. Only in the front, then she gets the sun in her eyes (dd is 13mths) I tried every car seat in the shop, fitted by an expert, but they all slipped straight out. My sisters Mama and papa's one fits, but she won't swap.. what can I do. please help!