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I'm confused about one thing - how did you request URL removal in Google Webmaster Tools if you no longer own the domain? It looks like Google is caching some pages of your Southernafricatravel.com domain and showing them as appearing on Preferredsafaris.com. When I dig into the cache, it's actually showing your main/active site. This could be because of an old canonical relationships between them (whether actual canonical tags, 301-redirects, or something similar), or it could be because they contained duplicate content and Google chose to view them as canonical. Sometimes, that happens even if you don't specify it. I don't love that the new owner has put up spam irrelevant to the domain, and it's possible that could bite you somehow, but I suspect it's unlikely. Once Google sees that this old pages don't resolve, I think you'll see them gradually disappear. There is no duplicate content at this point.

Thanks Chris, I can't believe I didn't pick this up myself....taken away at looking at a more complex issue/solution. Much appreciated.