Sorry I misunderstood.
So the costs you are refering to are domestic costs from the point of landing to delivery to your door? If so then that sounds about right. There are abou 9 seperate charges for this and that which amount to about £250 and then the transport delivey costs to your door.
I was under the impression the costs were for the China side.
Try
http://www.seawing.co.uk/ in future they are very good and very helpful.