As a Greek citizen, you have the right to work freely in the UK. But without the knowledge of English you should count first of all on low-skilled work. You can apply for this kind of work through the employment center. If you are outside the UK, then it's best to start with the Embassy of Greece and see their recommendations for their citizens to work in England. Maybe you have friends who are friends who run their family business and will be happy to hire a compatriot, for example, to a Greek restaurant in London.