Re the questions above about whether or not you get priority for the following week if you don't get in - I once had tickets to a recording of "They Think It's All Over", got stuck in traffic and so was at the back of the queue. We didn't get in and weren't offered any alternative dates! A ticket definitely does not guarantee entry.
Oh - and agree with the comments on production guests. "Friends of the Production" as they were referred to at AQOS were given all the seats at the front. I didn't know about the dress code for Strictly (this is the first year I have applied), but agree it doesn't seem fair to let the jeans brigade get the front seats at what is supposed to be a glitzy and glamorous show!