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Valerio, a little help with what I should be looking for willl be appreciated. :)

Zeegers, thanks for the Genus ID! If I see this fly again, I'll bear your comment in mind about it not being one of the 'common' species, and try and take a voucher specimen for proper identification by my colleagues at Liverpool Museum. If I had any idea that I'd alighted upon something potentially special, I would have taken the specimen right there and then, but my usual approach is to leave specimens in the wild to continue breeding unless there is a compelling reason to capture them. Even specimens I capture for the USB microscope, because they're too difficult to work with in the field, are usually released afterwards unless I'm alerted to the need to keep a voucher specimen by someone in the know.