Conduct a case study on how Brexit and uncertainty of Brexit plan for financial services have affected HSBC bank plc so far, in the context of performance and risk level. Your case study needs to include the following elements:

1. Explain the background of the mentioned topic, using appropriate references.
2. Clearly explain the objectives of your case study. This should include the details of which types of performance and risk you choose to study.
3. Collect financial data of your chosen UK commercial bank from a reliable source.
4. Carefully evaluate financial ratios/measures which meet the objectives of the case study.
5. Analysis of the financial ratios/measures, with the support of appropriate diagrams.
6. Critically argue whether the banks performance and risk were affected by Brexit.