John Minton was one of the most popular painters & book illustrators of the 1940's & 1950's. He also did a great deal of commercial work, including some posters. The following are the ones I know about (The London Transport posters are repoduced with kind permission. Their site is at
http://www.ltmcollection.org/)

1.
THE LOVES OF JOANNA GODDEN 1947. Ealing Studios. 76 x 101cms. Polychromatic. There are several variations of this poster, both in orientation & content. One such vertical variant shows a photograph of Googie Withers against a Minton landscape.

2.
EUREKA STOCKADE 1949. Ealing Studios. 76 x 101cms. Polychromatic. Again there were variants, one of which is shown below. Although it contains the same elements, it has obviously been re-drawn for the different format, and the colours were changed.

3.
FLY BEA TO SPAIN c.1950. 100 x 62cm. Polychromatic. Much in the style of Time Was Away, published in 1948 (picture courtesy Henry Sotheran Ltd)

4.
WHERE NO VULTURES FLY 1951. Ealing Studios. 76 x 101cms. Polychromatic. Again I believe there were vertical variants.

©TfL
5.
LONDON'S RIVER 1951. London Transport. 101.5 x 63.5cms. Polychromatic. A 'pair poster', with one poster showing the image and the other the text.

6.
CORRECT ADDRESS - EILEAN DONAN CASTLE 1957. GPO. 38 x 25cms. Polychromatic. 
7.
CORRECT ADDRESS - GREENWICH 1958. GPO. 76 x 51cms. Polychromatic. Commissioned in 1957, the year of Minton's death, and judging from the printer's code, published posthumously.

8.
CORRECT ADDRESS - BLANDFORD FORUM 1958. GPO. 73.5 x 91.5cms. Polychromatic. Commissioned in 1957, the year of Minton's death, and judging from the printer's code, published posthumously.