Is you shipper a private person or a company ?  
 
In the past I noticed that companies sometimes get a better follow up on their packages. 
 
Did he mark the package "return to sender if undeliverable" ? 
 
I had a package to Singapore that was routed via the US last december. 
It was also held by US customs and it took over 3 weeks to get more details. 
The package was finaly delivered to Singapore, but is was marked with "return to sender" ? because it contained a sword…  
  
Anyway, keep asking the shipper to contact the UK Royal mail. Tracing should indeed be done from his side.
		 
		
		
		
		
		
		
		
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