I agree with all of this.
I agree with the majority. [name]London[/name] sounds more feminine to me. I think [name]Sebastian[/name] [name]London[/name] is great.
What about using one of the boroughs of [name]London[/name] instead:
[name]Camden[/name]
[name]Brent[/name]
[name]Richmond[/name]
[name]Merton[/name]
[name]Sutton[/name]
Bexley
[name]Barnet[/name]
HarrowI agree with kala_way to maybe use a bourough. I like [name]Sebastian[/name] over [name]London[/name] as a first name.
[name]London[/name] is a girly name.
Although I do not think [name]London[/name] has “gone to the girls” at all, I am not a fan of place names. And [name]Sebastian[/name] has always been a favorite of mine. I also love the nn Sebi. I’m not really a fan of the flow of [name]Sebastian[/name] [name]London[/name] because of the double "n"s, but I like that his middle name would have significance and it’s not like lots of people will hear it together anyway. Definitely a vote here for [name]Sebastian[/name] [name]London[/name].
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[name]Sebastian[/name]. [name]London[/name] is silly.
[name]Sebastian[/name] is a great name for a boy… [name]London[/name] sounds a bit too unisex for my liking.
This exactly.
[name]Sebastian[/name]! Very handsome.
I live in [name]London[/name], and I think people might take the mick out of him if his name was [name]London[/name]. I’d go with [name]Sebastian[/name] and not tell the locals what his middle name is.
I prefer [name]Sebastian[/name]. I get where you’re coming from regarding [name]London[/name] being more unique, since [name]Sebastian[/name] is in the top 100 for boys’ names in the U.S, but even though [name]London[/name] is less used than [name]Sebastian[/name] the -den/dan/don ending is really common for boys right now, and I suspect that [name]London[/name] would just blend in with all of those. This is only relevant if he’s being raised in the U.S, though, and from your post I’m not sure if that’s the plan or if he’ll be raised in the U.K. If the latter is the case, I agree that the name [name]London[/name] might lead to some teasing.
[name]Sebastian[/name] is classy, stylish and intelligent sounding and [name]London[/name] just isn’t, sorry. I know people are saying that they live in [name]Archer[/name] or [name]Jasper[/name] or whatever but [name]London[/name] is an ancient, famous, international city and as such much more recognizable as a place rather than a name. Calling a child [name]London[/name] is like calling a child [name]New[/name] [name]York[/name] to my ears. And I know [name]Paris[/name] is used but that’s a mythology name so it has a different vibe (though I still dislike it!)
However, using [name]London[/name] as a middle name as that’s where your son was born suddenly makes it a bit cooler and quirkier and paired with the very elegant [name]Sebastian[/name] it takes on a different feel. The middle name spot can be very transformative! 
I don’t mean to offend you, I just really hope you choose [name]Sebastian[/name]!
[name]Sebastian[/name] [name]London[/name]. [name]London[/name] is typically used for girls and seems tacky for either gender.
[name]Sebastian[/name], by far! [name]Sebastian[/name] is handsome, striking and classy, whereas [name]London[/name] is unisex at best, trendy, and more than a little tacky.
I actually would love to argue in favor of [name]London[/name]–on a girl, it seems quite trendy, but on a boy, I’ve been impressed. I met a man named [name]London[/name] several weeks ago and remember loving it–less trendy than [name]Landon[/name], striking, and he wore it well. But I do agree with what the others have said, I have heard very strong reactions to naming a child [name]London[/name] if (s)he lives in [name]London[/name], and I really don’t think it’d go over well, unless you are moving out of [name]London[/name] (and the UK, for that matter) straightaway. So in that case, I would go for [name]Sebastian[/name] [name]London[/name], which I actually prefer as a combo, anyway. Plus, [name]Sebastian[/name] has amazing nns that [name]London[/name] just doesn’t have (imo)–[name]Ash[/name], [name]Seb[/name], [name]Bas[/name], etc.
Good luck!
If your child is born in the UK, does that automatically give him dual citizenship? [name]Even[/name] if you are planning on moving out of [name]London[/name] soon, there is no doubt he will have some emotional ties to [name]England[/name]. And if he will indeed have dual citizenship, then who knows where he’ll want to go to college or try to start a career. [name]London[/name] would be a horrific name to have. I mean, could you imagine naming a kid Chicago and having them go to Northwestern and try to get a job at a Northern Illinois law firm or something? It’s one thing naming a kid after an obscure town in the country you live in that has meaning to you (e.g. [name]Alton[/name]). Another naming a kid after the biggest city in the country.
Definitely go with [name]Sebastian[/name], whether or not you’re staying in the UK the idea of naming him [name]London[/name] will just come across as tacky to Brits… and [name]Seb[/name] is a cool nn 
I love [name]Sebastian[/name]. Having previously lived in the UK a child named [name]London[/name] would not be well received. That’s the thing about place names- they don’t travel well at all.