Email about gay marriage in the UK

A couple of weeks ago, I received an email from a gay guy who's interested in marrying his boyfriend:

Hi,

Greetings from Singapore.

First of all, I want to say that reading your blog is bliss. Thanks for all the sharing, some of which can be inspiring for me. Anyway, I would like to seek your advice on gay marriage.

My bf and I are planning a 2 week trip to Iceland next year. Tentatively, we planned to transit either in London or Paris, or if not a city that we have never set foot in, Copenhagen. I was toying with the idea since we are going to travel so far to the west, I might as well seize the opportunity to get married in London, giving my bf a big surprise.

Can you refer me a website that specifies details (including legal implications) on gay marriage registration in London? What is the address? Do you happen to know which other European cities that allow gays to register marriage?

Thanks! Hope to hear from you soon.

I’ll say I’ll never wake up knowing how or why.
But never is a promise and I’ll never need a lie.

Interesting poetry at the end, although I'm not sure I understand it!

Anyway, "gay marriage" in the UK is called "Civil Partnership", and I found the following two useful web sites about it:

• The UK government's web site
• A web site created by a UK law firm

Note in particular the Residency requirement, because it says that

You can register a civil partnership in England and Wales as long as you have both lived in a registration authority for at least seven days immediately before giving notice of your intention to register the partnership.

However I had thought that it was necessary for one of the guys to be, if not a UK citizen, then a citizen of an EU country. But citizenship doesn't seem to be specified.

To check on this, I emailed the law firm that set up the civil partnership law website that I mentioned above, but they never replied. I couldn't help wondering why they bothered to put up that web site, as an advert for their expertise, if they're not going to respond when it creates an enquiry. So perhaps for legal advice it's best to look elsewhere.

Anyway, I know that there are a few lawyers who read this web site so perhaps they know the answer to this? Or do any readers have any information on gay marriage or civil partnership elsewhere in the European union?