If you're not from the UK, you'll need to use a manual proxy like:
22.214.171.124 with port 80
Join the club if you're not already a member.
Scroll down and enter following code to unlock the interior: 3607342152748
and click 'Unlock'.
When you go to your suite and open the box you'll get a message saying the interior is unlocked and can be found under 'Room Design'.