Emailing is the best way to be pushy, without letting them know that you're being pushy. Notes will help you understand whether you need to panic (interview queue) or if they are just being slow.
For now, just email a professional and respectful email to the MP's office. Their staff will contact you and let you know on the latest. You will also have to sign a consent form for them to request information on your behalf. So, if you have access to a printer and scanner, you can do all of that electronically and send it off the same day.