If the older one is fine then just stick with it. Less bother than relisting the old one and arranging pick up of the new one.
Thanks Arte, that's how I'm feeling except for the fact the newer model has deeper seats - can fit up to 5 year olds! DD1 only just fits in the older model. Stupidly I didn't take her with me to view it, I honestly thought she'd have loads of room.