To be honest Aaronsmummy if I was you I'd splash out the extra 99 quid and get the new Nipper360 (on Kiddicare) which has a swivel front wheel.
If you do buy the secondhand one then I would make sure that you get the remains of the guarantee, just in case.
Also, why was it only used twice?????? (sorry, but am a very suspicious person!!)
Good luck.