If I visit http://www.endsleigh.co.uk/Pages/Endsleigh-App.aspx then the request completes with a URL of https://www.endsleigh.co.uk/personal/
When this kind of thing has happened before with other sites, I've seen 3xx responses in Firebug, followed by the request to the second URL. But this time I don't see that, and Firefox's Live HTTP headers add-on doesn't show this either. It's as if I'd never typed in the first URL.
Then I tried it in Chrome, and saw a 301 redirect. Why would this be shown in Chrome but not in Firefox's native tools or headers add-on or indeed in Firebug?