The success rate of immigration lawyers in the UK can vary significantly based on the complexity of each case and the individual circumstances involved. Generally, experienced immigration solicitors may have higher success rates due to their familiarity with the legal system and regulations. It's essential to choose a solicitor who is regulated by the Solicitors Regulation Authority (SRA) and has a proven track record in immigration matters. For more precise information, consider discussing your specific situation with a qualified immigration lawyer who can provide insights based on similar cases.