FYI, the threat level is 'yellow' so they only accept scheduled biometric appointments for that day (according to my Application Support Center). You would have to have a really good reason to be accepted as a walk in (which they do not officially have as an option). You could try though, they are people after all, not machines. The worst thing that could happen (apart from a 500 mile drive in vain) is them telling you to reschedule if you cannot make your appointment. However, in your case onebowl, your bio is scheduled one day after the interview, and it's not like you can't make it to it, it's just a matter of "convenience". I don't see why you would worry about doing the biometrics a few days before your interview. If you have a good interview and they approve you, your only hold will be the biometrics, which you will get out of the way the next day. You are in a more fortunate position to have been called for the interview a little over a month from becoming current. Good luck and keep us posted.