Score

Nice list. Thanks.

great list, thanks so much!

Removed, for not being BRITISH novels:
11/22/63
The Shadow of the Wind
The Kite Runner
A Thousand Splendid Suns

Removed, for not qualifying as a work of MODERN British literature:
The Pilgrim's Progress

Removed for being neither by a British author nor a novel/work of fiction:
Imagined London: A Tour of the World's Greatest Fictional City

Lionel Shriver, whilst brilliant, is not British

The author of Let the Right One In is Swedish as far as I am aware...

Diane Chamberlain & Stephen King are American...

Camilla Lackberg & the author of Let the Right One in are both Swedish...

Murakami is Japanese...

Great list but they are not all British. Let the right one in, The hipnotist, etc.

Gone Girl is not British

Suzanne Collins, Erin Morgenstern and R.J.Palacio are not British.

How strictly is the "last 15-20 years" thing being enforced? Given that the list was started in 2008, the earliest pub date on here should be 1988.

Clockwork Orange, e.g., was published in 1962.

Suzanne Collins ('The Hunger Games') and Scott Westerfeld ('Uglies') are both American, though very good authors

Jessica wrote: "Suzanne Collins ('The Hunger Games') and Scott Westerfeld ('Uglies') are both American, though very good authors"

Gone.

Jane Eyre I would not classify as a modern British novel as published around 1845 or 6.

Gone.

I'm with lobstergirl on this one and would appreciate a more clearly defined and properly moderated premise. If this list is supposed to cover "the last 20 years" then I would suggest that any book published more than 20 years prior to the current date (let's say anything earlier than 1994 as I am writing in 2014) shouldn't be on this list.

Removed for not being either British, or modern, or novels:

Shirley Jackson
Lemony Snicket
Tracy Chevalier
Sharon Maas
Evelyn Waugh
George Orwell
Malcolm Gladwell
E.M. Forster
Rohinton Mistry
Thomas Hardy
Khaled Hosseini
Vikram Seth
Anita Shreve
J.M. Coetzee

I've added a more concrete time-span for admissible books: The last twenty years, or, 1994-2014. That's this current (incomplete) year plus the 20 whole years that preceded it. If this new, unambiguous premise is considered acceptable then we can start removing the inapplicable books i.e. anything from 1993 or earlier.
Here are the top 3 books that would be removed: Remains of the Day (1988), Possession (1990), Trainspotting (1993).

I would suggest taking into consideration when the list was created, 2008. So the list creator intended books from 1988 forward to be on the list. I wouldn't therefore remove the books you mention. I would just allow books from 1988 to the present.

On the other hand the word "modern" implies that the books are recent to a certain extent. The problem with a set date i.e. 1988, is that it does not remain recent. Books from this date therefore become increasingly less "modern" as time passes and so become increasingly less relevant to a list of "modern" books. This is why I suggest a constantly moving time-span of the latest 20 years because it conforms more closely to the premise of "modern books" than the "1988 to present" time-span.