Sizing isn't accurate, I would say but a size bigger than you would normally take. The sweater I bought had very short arms, I' fairly confident its not meant for a UK market, having bought from China its sized like this. Also, I would normally return the items straight away, but given that you have to pay to return is absolutely ridiculous and disgusting. I picked up the order from a store so I dont see why I can't return to a store, its obvious that this is done to discourage people to send returns back.
I'd say look elsewhere first.