Here are some links to websites where you can search for teaching jobs in the UK.
There are lots of jobs advertised on this site especially for summer school.
This website has lots of information about teaching English and it has this job advertisement section with some jobs in the UK.
This is an association of recognised English language services in the UK and you can search schools by location and then send your CV to them directly. It has changed name recently to EnglishUK. use the course search option on the home page to find schools in the area you want.
This is a job search website with lots of jobs in the UK.
This site has TEFL jobs in the UK. Many of them are for experienced teachers.
This is a classifieds site and has TEFL jobs, mainly in London.