Upvote:3
Legal advice is something that nobody is qualified to do (or could legally do here).
However, your broad questions of do you need/should you apply for a Visa is reasonably well covered by the offical UK government visa checker:
You wonβt need a visa to come to the UK
However, you should bring the same documents youβd need to apply for a visa, to show to officers at the UK border.
You may want to apply for a visa if you have a criminal record or youβve previously been refused entry into the UK.
You've been refused a work visa in the past. This will show up when you arrive in the UK. For any future entry, or any visitor visa application, you're going to have to try quite hard to convince the authorities that you don't intend on trying to work.
Your liklehood (or lack thereof) of obtaining a Visa I wouldn't care to comment on. You can find out more about UK visitor visas, along with application guidance on gov.uk