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This is what the rules stipulate "No Employment as a Doctor or Dentist in Training, unless you:
**** have obtained a primary degree in medicine or dentistry from a UK institution that is a UK recognised or listed body, or which holds a sponsor licence under Tier 4 of the Points Based System; or
*** you are applying for leave to remain and have, or have last been granted, entry clearance, leave to enter or leave to remain that was not subject to a condition restricting your employment, whether that is employment as a Doctor or Dentist in Training or otherwise, and have been employed during that leave as a Doctor or Dentist in Training."
A Tier 2 applicant can do a second job in the same sector and at the same level as your main job for up to 20 hours per week. If the job is in a different sector as the main job then the applicant will need to make an new application.
If you are looking for advice on your question, this is not the place receive it. You would need to seek legal advice. I am only able to give general answers to questions on JA. The answer I have given is based upon the guidance.