The old OTA unlock method provided for developers by orange has moved, to reflect the new look site they have launched.
To Unlock your phone (spv and e100) simply follow this simple guide:
EDIT newer decert page is here
Select 'Developers Zone' from the tabs along the top
Select 'Signature Devices' from the menu on the left.
Select 'SPV Classic' or SPV E100' from the list now shown.
Now click 'Disable/enable the security model' and follow the familiar instructions.
I have purposefully not given a direct link, so you have a look at their new site, and read the various terms and conditions.