Hmmm... seems to work fine for me!
Try the following:
1) Clear your internet cache. Often, Future Comps pages will be cached from the last month you entered, even if you enter a separate URL.
2) Make sure that your security settings are set to allow these pages. Make sure
http://www.futurecomps.co.uk/ is added to your safe sites list.
3) Check spelling! I touch type so I always misspell website addresses (sometimes with unfortunate and embarrassing results!) The URL should be
http://www.futurecomps.co.uk/readerchallenge43
4) If it is still not working, drop me an e-mail with your web browser and version number, operating system and details of the error you're getting and I shall investigate!