Ask an Immigration Solicitor. Get an Answer ASAP.
Good afternoon, I am Lawyer Ak and I will be assisting you today.
You would need to
Update your visa and inform the home office if the job is currently not in the same sector that you are in now.
If you fail to declare and home office find out then your visa can be curtailed.
It means you visa can be stopped and you can be asked to leave U.K. for deception.
If you have already left the U.K. then this will not affect future visas.