Royal Doulton Figurines - would love some more info.

I recently acquired 4 Royal Doulton Figurines of the the Dancers of the World series, including: Spanish Flamenco Dancer, Indian Temple Dancer, Philippine Dancer and Scottish Highland Dancer. They are very beautiful models! Issued between 1977 and 1978, they all come from limited editions of 750 each, and have the model number handwritten or printed on the underside of the model, and within the official model certificate.

However, not knowing much about figurines, I'm don't really know a lot about them. I was wondering if someone could enlighten me on some details about Royal Dolton figurines? The Dancers of the World Series? Much rare they are, and how much they are worth?

Many thanks!