I am from Prague and want to work in London. I have passed Cisco CCNA,
have experience with linux adminnistration and php programming (I do
not enjoy programming a lot).

What type of job in London can I would look for and how can I find job
for foreigner?

Write a CV, search on something like "IT recruitment agency London"
and find as many places to send your CV or post it on-line as possible
(for instance http://www.itcareersuk.com/myjobs/signup.php).

My guess is you are unlikely to get anyone to pay your expenses to
come from Prague for an interview.  You are much more likely to get a
job if you are already in London and available for interview. 
However, this is based on the last time I was recruiting IT staff in
London which was a few years ago.  If anything has changed, the
recruitment agents ought to be able to advise you - you could email
them.

London housing is very expensive.  Young lawyers share flats, for example.
I would check out the cost of living there before accepting a job.
Myoarin