I'm pretty sure this is all Sowerby County yes. The candlesticks are a similar shape to those of the Sowerby Minor set, but are a different pattern. I believe that either the County set had updated candlesticks or the set as shown in the catalogues wasn't issued with the sticks show. Have we ever seen the catalogue version of the County candlestick?
The mystery set 18 needs to be updated to reflect this.