Disclose! If you don't disclose and are found out that would certainly put you in a bad light....
Have you been through the caseworker guidance relating to the "Good Character" requirement?
If not here's the link:
https://www.gov.uk/government/publicati ... y-guidance
Note this quote from the guidance:
"Consideration must be given to all aspects of a person’s character, including both negative factors, for example criminality, immigration law breaches and deception, and positive factors, for example contributions a person has made to society. The list of factors is not exhaustive.
Each application must be carefully considered on an individual basis on its own merits. You must be satisfied that an applicant is of good character on the balance of probabilities. To facilitate this, applicants must answer all questions asked of them during the application process honestly and in full."
It's probably a good idea to be pro-active and submit a covering note describing your history both negative and positive, you can apologise of course but best to make sure your positives stand out.
We can't tell you whether you will be successful or not, bearing in mind that good character is subject to discretion. Other applicants with a difficult history may provide some input on their own experience.