Originally Posted by Jenny S.

After getting married you take your marriage certificate & passport and go down to Grosvernor Square, and visit the Consular Affairs Dept./American Citizen Services at the US Embassy. Depending on how long your passport is valid they will either give you an application for a new passport or amend the name on the last page of the passport with a hand written reference on the main page.

US drivers licenses are State issued and have to be changed in the USA, which can be easily done at the DVM in your home state if you go back to the USA.

For all UK issued documents (like ID card, EU drivers license, etc.) you need to see the appropriate UK authorities.