1. I actually find it very strange when I find my seat at a wedding and there is a pre printed card that says "Bride and Groom thank you for your thoughtful and generous gift" How do they know it was either? Wait until afterwards.

2. Sign with your maiden name.

3. Unfortunately there is no one form to fill in. Would be great if you just stood on a line at a government office and said my name is now.....

As someone else said you need to get the official copy from births, deaths and marriages. You will need to show this to banks etc. rather than the fancy one.

I didn't pay for new drivers licence etc, but the expiry date stayed the same. You have 1 year I think to change your passport for free.

Remember that you can use any name you like, so long as you aren't trying to commit fraud. So you can leave some stuff in your maiden name. Quite a few of my bills are still in my maiden name. The only problem is if you need to prove who you are. It is worth having ID and major things like bank accounts all in the same name.

Good luck!