Ok. I went to Wimbledon DVLA yesterday and had success!

I only waited about 10 minutes to be called to a window (on a Monday afternoon).
The guy was able to check the application was complete and the documents were ok (but he still sent off my marriage certificate and BRP).
I only had to pay for the return shipping (£6.35 for up to 500g)- special delivery next day. I didn't need to pay for it to be sent to be processed- only for it to be sent back to me.
http://www.royalmail.com/delivery/business-delivery-options-uk/special-delivery-next-day/pricesThere's a post office/convenience store just up the road (away from the mall) where I got the special delivery envelope- the DVLA guy directed me there.
He asked if I had a passport photo. I did and he used it (I'm glad because it's a good photo as far as passport photos go). I didn't see a place for them to take photos if I hadn't had one with me. I think he may have asked me to go outside to a photo booth in the mall or something and come back with the photo.
I was able to pay in cash (also could have done credit or debit, I think).
He gave me an official receipt acknowledging which documents I submitted and how I paid.
He said it'd be about 2-3 weeks for everything to get back to me, but another guy later (when I came back with the envelope) said it'd be about a month.

Still, not too bad considering Christmas mail and maybe being closed for a bit over the holidays.

The guy was very nice and helpful.

A good change from the DMV in the States.
Oh- if you're going, bring a pen. They don't have any out and are protective of theirs.

My Highway Code book came yesterday, so now I can get to studying!
