https://www.slab.org.uk/faqs/what-if-slab-refuses-to-give-me-legal-aid/
If we refuse your application, we will tell you and your solicitor the reasons for this decision.
You or your solicitor can ask us to reconsider our decision – in civil and criminal cases you have 15 days to do so from the date we refuse the application. In children's cases you have 14 days.
If you ask us to reconsider the decision, make sure you tell us the reasons why we should.