Speck...fyi for you...
I just tried the advanced search from the site, and links are not working...
Main home page, the link in the announcement called "IWM Advance Search" is not clickable...
When I found that, I clicked on "Updated Advanced Search for online Store" link, which took me to the corresponding page, and the same "IWM Advance Search" is again not clickable.
This is true on Google Chrome & IE10...based on the coding of the page, I'm guessing it will be the same with Firefox & Safari.
Your link above works