I apologise if this is the wrong place to post this, as I'm a native speaker of English, however, I'm really not sure where to look regarding this question.  I'm from Australia, and I speak with the General Australian accent, with perhaps a hint of Cultured Australian.  However, I'm interested in modifying my accent to be more like Received Pronunciation, or Oxford English as it's sometimes called.

While there are accent coaches in the city I live in, and this would be the most effective method of doing this, unfortunately I can't afford these lessons at the moment.  I was wondering if anyone knew of any computer programs or audio recordings that I could use to work on this myself.  I do have someone familiar with the accent who can give me feedback on my progress.