For clarity: I am addressing this further assuming it is about
Foreign National inadmissibility, such as for someone applying to become a Canadian PR, not about what might result in a Canadian PR becoming inadmissible.
It's a Magistrates' Court level offence in the UK with, IIRC, £1000 maximum penalty. Almost certainly not going to make you inadmissible.
Your conclusion may very well be correct.
If I was to
guess, I'd guess it is correct.
And similarly, many FNs in this kind of situation (a minor breach of law resulting in a small fine) are likely to go ahead and make an application for a visa or such, of course disclosing the charge/record in their application, and then see how it goes,
most expecting no problem. Doing so reasonably expecting little or NO problem.
For the OP, here, the encouragement is indeed likely to be well-founded.
That said, in general, however, how an offence is actually handled in the country where it occurred, or which court handles it, does NOT determine its effect for purposes of Canadian immigration.
That is, the conclusion does not necessarily follow from the predicate; that is, the import of this relative to FN inadmissibility does NOT depend on which court handles these matters in the foreign jurisdiction.
Questions about criminal inadmissibility for FNs are tricky, rule-driven, and not readily intuited, and are rarely suitable for guessing. (And if there is a formal police criminal history record, it is absolutely not laughable.)
What matters is the Canadian equivalent.
The possible disposition, probable disposition, and the actual disposition in the country where the violation occurs, can be information, respectively, from which a reasonably likely inference might be made. For example, a small fine signals a minor breach of law, which is quite likely to be similarly categorized in Canada, thus as either an infraction or Summary Offence. No inadmissibility issue triggered.
And, disposition in a venue/court which only handles what are typically the equivalent of an infraction or Summary Offence in Canada, suggests the likelihood it is a violation for which the Canadian equivalent likely is an infraction or Summary Offence. NO inadmissibility issue triggered.
BUT it is important to recognize that what matters is THE CANADIAN EQUIVALENT, and NOT which court handled the matter in the other country, NOT what the disposition could be, usually is, or what it was in the other country (unless there is a total discharge without any conviction).
And when considering the Canadian equivalent, it warrants remembering that many, many rather minor offences in Canada, even many for which the charges can be handled by being issued a ticket and the payment of a fine, that is as a Summary Offence, in the Canadian "Criminal Code" many of these are hybrid offences which can be prosecuted by indictment, even if it is rare to prosecute them by indictment. AND these "hybrid" offences are considered indictable offences for purposes of Canadian immigration. Triggering inadmissibility (unless rehabilitation conditions are met).
Determining the Canadian equivalent is easy for some violations and offences. For many, however, it is NOT so easy. The specific elements of the offence must be compared with elements in similar offences as defined in the Canadian Criminal Code.
As I alluded, the court that handles the cases in the foreign jurisdiction (such as the "Magistrates' Court" in the UK) can be a big clue. BUT that is NOT what matters.
Thus, what is considered and handled as a rather minor offence in another country may nonetheless constitute a hybrid offence in Canada, and thus be considered an indictable offence, triggering FN inadmissibility.
It can work in the opposite way as well. For example, a failure to satisfy certain types of obligations can be considered a serious offence in some countries, even resulting in significant periods of incarceration; in particular, the failure to pay certain kinds of debt can be prosecuted as fraud, a serious type of fraud, resulting in relatively severe punishment. This conduct is NOT a crime under the Canadian criminal code. So a police record showing a conviction for this type of offence, no matter how serious it is treated in the country where it happened, does NOT trigger a FN inadmissibility issue in Canada, because there is no equivalent indictable offence in Canadian law.
As I previously commented, I do NOT KNOW much at all about UK criminal law. And I do not know the Canadian criminal code much either. So I do not have any opinion about what the Canadian equivalent is in the OP's situation. As noted, I'd guess that
@zardoz's conclusion is correct. But I'd do so emphasizing this is just a guess, cautioning that knowing which court handles such matters in the UK is just a clue but NOT determinative.