I posted this before a few days ago but for all those poeple getting p*ssed off pressing F5, here's an add-on for Firefox which can auto-referesh your page as often as you set it to (I have it set to 10 seconds). If your not using Firefox it might be worth installing it for this purpose alone. You can always revert back to your old browser:
Only takes a minute to install. When you get it set up, right-click on your webpage (i.e THE PORTAL!) and it will give you whatever period you want to refresh with (i.e. 5 secs, 10 secs, 30 secs etc). Rememer though, as soon as you see required tickets pop-up, right-click and disable. This will stop the page refreshing in the middle of you entering your CC details and wipe previous entries out.
I have found this an invaluable weapon! Enjoy.
Now roll on Italy tickets today and I'm done with this bast*rd portal!