It is possible to change jobs and employers while in the UK, however, the correct process to do so depends on your circumstances. If a foreign worker wishes to switch to an eligible job with a new employer, you must update your visa. This means you will need a new Certificate of Sponsorship. If your dependent family members are with you in the UK on this visa, they will need to update their visas as well. The only time you can change jobs without updating your visa is if you are working a different job with the same employer as your original visa and the job is in the same occupation code.