At the moment, although you can access the Windowlight site, it seems that the secure server is not available. This means that orders can't be completed. I will get this sorted out as soon as the support folk are on deck in the morning. Sorry about that.
UPDATE: This is now working, albeit without images. I've done a test, and it does has full functionality.
FINAL UPDATE: Images now working fine, these were an unrelated but coincidental issue -- easily fixed by me, because I caused it in the first place...