This page solves the problem of cached  pages, stopping up-to-date versions being displayed.

If you are having difficulty viewing the most up to date pages on this website, it is likely to be due to caching.

Caching is the process where your browser saves details about the page you are visiting, so that when you visit it again in the future, the page will load more quickly.

Holding control at the same time as pressing the refresh button should resolve this problem. 

You can alter the caching options, in Internet Explorer, by going to Tools, on the browser toolbar, and then Internet Options. From here you can clear the cache, and also specify how many days you want page information to be held for, in the future.