Well I can't answer for Sue but although there has been a problem with some people getting guest access due to duplication in the database entries (for which there is a solution)for the vast majority of Moodle sites of different version, guest access works just fine. My school uses Moodle (1.9) as their website and the School demo Moodle http://school.demo.moodle.net/ is all guest access and that works fine too.
Guest login problem (v.2.2.5+)
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