How many different publications (newspapers, magazines) are there in
the United Kingdom?

Hello Axelson

A good working estimate is about 9,300.

"There are 1,286 regional and local newspapers in the UK today,
including 27 mornings (19 paid-for and 8 free), 75 evenings, 21
Sundays, 526 paid-for weeklies, and 637 free weekly newspapers."
http://www.newspapersoc.org.uk/default.asp?cid=333

"There are 20 national newspapers (daily and Sunday) and over 1,300
local daily and weekly newspapers"
http://www.prospects.ac.uk/cms/ShowPage/Home_page/Explore_job_sectors/Publishing/As_it_is/p!ecLagi;$EAqL$0

"The UK . . . has approximately 20 national newspapers (Daily and
Sunday), which are owned by 7 companies."
http://www.transparency.org.uk/UK_NIS_country_study_report.pdf

"The magazine sector is far larger than is generally appreciated.
 - Estimates of the number of magazines published in the UK vary
 - British Rate and Data (BRAD) lists almost 8,000 separate titles
which carry advertising
 - In the last ten years, the total number of magazines has increased
by almost 25 per cent"
http://www.hurtwoodmedia.com/phpnuke/html/modules.php?name=News&file=article&sid=71

"there are now more than 8,000 magazines published in the UK (as
opposed to just over 1,000 newspapers)"
http://media.guardian.co.uk/site/story/0,14173,1494741,00.html

"There are over 8,000 magazines out there"
http://www.apa.co.uk/cgi-bin/go.pl/features/article.html?uid=482

I hope this is helpful.

Best wishes - Leli


Searches on Google UK:

"magazines published in the UK" media guardian
"8000 magazines" UK
"19 OR 20 national newspapers" UK
"local newspapers in the UK"

Very informative answers.
This was exactly what I was looking for.