Did the item come to you from China or was it posted within the UK?
On the sellers' listings, are items shown as being in the UK?
You need to open a return through Ebay using the reason 'faulty item'. If the item was sent to you from the UK, you only have to return it to the UK.
"There are two ways to be fooled. One is to believe what isn't true; the other is to refuse to believe what is true.”
Søren Kierkegaard, Danish philosopher (1813 - 1855)