score:6
You can apply, but your application is virtually certain to be refused unless you can demonstrate a credible reason for wanting to visit and that you have:
strong ties to your home country that would compel you to leave at the end of the visit (which seems unlikely, since youβre already in Australia on a visit visa) and
sufficient funds for the trip (which would require 6 monthsβ bank statements from you, irrespective of whether you have a sponsor) that are genuinely available to you
https://www.gov.uk/guidance/immigration-rules/immigration-rules-appendix-v-visitor-rules