A fascinating sale of duplicates (as I understand it) of some of the best, most talented and ... that terrible word .... iconic posters commissioned and used by London Underground and London Transport in the past will be held on October 4 at Christie's in South Kensington and the pre-sale exhibition will be held there from September 28 to October 3. A number of the best graphic artists were given their first outlet or made successful by the remarkable policy of commissioning the best.
The three examples are respectively by George Sheringham, Andrew Power and Annie Gertrude Fletcher.
Curiously, the Daily Mail article gives no examples of Edward McKnight Kauffer, possibly the best of the artists whose career was made by London Transport. Here is one example.