Dawn:
Thanks for the reply.
Donna:
Most British visitors to Oz enter with an ETA (which is effectively a visa obtained online). One of the rules for using an ETA is this:
"You must not have any criminal convictions, for which the sentence or sentences (whether served or not) are for a total period of 12 months duration or more, at the time of travel to, and entry into, Australia".
So, unlike the USA, there's no automatic bar to the simplest way of getting in, just because of an arrest or minor conviction. It's only convictions which have resulted in prison terms (totalling at least 12 months) which officially prevent visitors using an ETA.
Once again, however, the immigration authorities don't have direct access to UK criminal records, so many people probably just 'chance it' and use an ETA.
http://www.immi.gov.au/visitors/tourist/visa-o ptions.htm
Chris