In reply to Dave Perry:
I'm not sure about that Dave, I think the Suez sees more UK/EU goods than the Panama does. Remember the Marco Polo arriving in the UK a few years back with the nation's Christmas shopping aboard?
http://www.theguardian.com/uk/2006/oct/30/christmas.shopping
The Marco Polo has a beam of 175 ft, the Panama Canal has a max width (at the moment) of 110 ft. Have a search of the USN Iowa class transitting the canal - specifically designed to have 12 inches clearance each side when passing through the locks.
Other than the width - which granted is only an issue for the largest ships - there is also the distance to be taken into account.
http://www.bloomberg.com/news/2013-03-11/maersk-line-to-dump-panama-canal-f...
This suggests there may not be much in it but who knows what routes container ships are taking and where they are dropping off cargo enroute etc?
There was a documentary about the Panama on PBS a few months ago, a massive project then as it would be now - there was something I read recently about the Chinese building an alternative canal through Nicaragua but I haven't seen much else on the subject.
Post edited at 13:28