There is a set process for checking the condition for a Class 1. . RBBB is normally caused by a natural process but can be caused by coronary heart disease, and this needs to be discounted. If the initial set of tests is not irregular, you will operate on an OML for a year (no single pilot ops), and a follow up examination will be made after a year. If that is OK, the OML will be removed. The medics can call for another look by a specialist in the future if they wish. No other problems for 11 years since diagnosis. The process may have changed, you will need to check.