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My understanding is that Australians don’t need a visa for stays in the UK less than 6 months regardless of their record, so I can't see it mattering in terms of the RWC. Other locations (the States perhaps?) might be a bit more hard-line, although probably not for a tourist visa and something as relatively minor as this.
It will be interesting to see what they charge him with though. It all seems to be variations on trespass, which I think all have maximum sentences of 6 months. Not that I think any of them will get anything like that, probably just fines. Normally I'd expect them to look for spent convictions, but that would require them to convince the judge that they are unlikely to do it again and the stuff said since might make that a bit of a hard sell. But an interesting quirk might be that, as I understand it, the Commonwealth Constitution precludes anyone convicted of an offence carrying maximum of one year of imprisonment or more from holding a seat in Federal Parliament. Not the imposed penalty, the maximum. I am not sure whether that is specifically an individual offence or whether it applies collectively, but as I say it could be interesting. I expect it will all be minor misdemeanours (more civil naughtiness than any real sacrifice), but how the ARU reacted may not have been the only career decision in play. I'm sure they could get nasty if they wanted.