There are some jobs in the UK for which there is no need of work experience. These jobs include cleaning and driving jobs. In most of the jobs, employers need the work experience of at least one year. There are cases in which the employers do not want to waste time in training the employees. Getting work experience is not impossible. Rather than waiting for an advertisement for a job, you need to knock the doors of the companies and ask for jobs.
It is better to try for such organizations and ask them that you want to provide your services on a trial basis. The places where you can give a trial is advertising agency, factories, hairdressers shop, and many more.