Chances of obtaining UK standard business visa

[Himha]

Hi.I had overstayed my Australian visa for 9 months due to prospective marriage with an Australian citizen which did not solemnize in Australia but we got engaged in a small family ceremony.Not being fully aware and being able to understand my visa options as a partner of an Australian citizen then, I voluntarily left the country at my own expense and both me and my partner came to India. We got married , witnessed by my parents and now my husband lives with me on dependant visa in my home country.
I have recently got a fabulous work opportunity for a project for one month in the UK sponsored by a well established company . I have all necessary documents including finances, work profile etc to show that I'm otherwise credible. Before Australia I have also travelled to US, Canada, Schenegan area multiple times without any history of overstay.

Considering this situation what are my chances of getting visa for the project.