1. Dear Ola, the first thing you should be clear upon is that you don't have a criminal record. In order that you would have a criminal record, there would need to have been involvement of the police and you would have been issued with a caution or some notification of an offence occurring. So there is no need to notify in respect of either of the occasions, should you not wish to. Additionally, be aware that the test of "good character" for citizenship does not preclude someone with a criminal record from obtaining citizenship. Even if you had committed a minor office - which you have not - this would not preclude you getting citizenship so long as a period of time has elapsed since the commission of the offence. Be aware that minor offences, such as shoplifting are generally ignored.
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3. No, you don't have to disclose these incidents as they do not involve the commission of a crime.