QUOTE(Jeraly @ Dec 30 2007, 11:43 AM)

This is (apparently) what it says on our hard copy that my OH has just opened - does this mean we *must* be approved by this date? What if we aren't?! I haven't come across anyone else mentioning it before!!
Cheers!!

Yep, the NOA2 is valid for 4 months. But don't worry if you haven't had your interview by then because the Embassy will just extend it, especially if it's not your fault and it's because of the wait for it to go to NVC then the wait for the interview etc. If you're getting close to the April date and you don't have an interview scheduled you might want to send a quick email to the Embassy just to let them know and they'll extend it, but I believe they normally just do it automatically at London.
Gillian