Quote from web page:
We’re giving you a ticket to follow your travelling ancestors all over the world, absolutely FREE! From 29th August to 5th September, you can search and view all our immigration records – without paying a penny!
* To search our immigration records, you’ll need to register for FREE. All immigration records are available to search for free from 11.59 on 29/08/2011 BST until 11.59 on 5/09/2011 BST.
Nice! Started a family tree but then saw how much it cost to follow those 'leaves' I decided to stop watering it. Looks like ill be out with the watering can this week ;)