In the circumstances you have described, immigration will defer processing until your medical is completed. As a radiographer you should not need me to tell you that there is no safe dose.
My query is that I am planning on visiting the UK this July for a month or so, do I have to stay in the country until my application has been approved?
You might want to instruct your agent to edit your EoI, taking into account your nominated skilled occupation and the states or territories for which a nomination is available. It might be of interest to note that employer nominated visa applications are not points tested and EoI is not needed.
If condition 8503 is imposed mother will not ne able to apply onshore. If you want me to have look at your case go to my website pinoyau.com and use the contact form.
In most cases, but not all, if a marriage was legal in the place where it took place then it will be accepted for Australian migration purposes.
This is a comment on a post and is NOT considered professional advice,
re ask-an-agent.com (and similar 'services') The world runs on BS. You do not need a lawyer, You need a registered migration agent. Paul is as good as any!