The 203 was well priced on release and Peugeot must have supplied at an attractive price. Starting at 895 pounds, in a period of rapid inflation and import regulation changes the price was all over the place, it was around 950 pounds in 1951 when the car was 732 pounds in France. This is closer to the French price than later models considering it was carrying around 200 pounds of duty. It wasn't going to be a best seller given you could get a Holden for around the same money or a comparable British car for 150 to 200 pounds less. But it was affordable to the middle class buyers who appreciated its engineering and performance. Market penetration in 1951 would be much the same as selling 15000 cars in todays market.
Real prices altered a lot with inflation and a falling real price due to efficiencies of mass production. The real price of a 203 in 2020 dollars in 1950 was $47500. By 1955 the Australian assembled car was $36940.
The Australian market had a firm idea of what a Peugeot was worth. When the real price increased sales fell, when it returned to a more realistic level sales picked up. In 1956 the 403 was overpriced at $48270 and sales halved. When the price was reduced in 1960 to $36970 sales more than doubled. At the end of 1962 the 404 was released at too high a price, $43170 and sales almost stopped. When the price was reduced to a more realistic $32360 sales began to pick up by 1968.
Chrysler showed with the Simca Aronde a French car with efficient local assembly could be got down to British price levels. The Aronde was priced in France the same as the 203. In 1963 the Adelaide Aronde was selling for 999 pounds, the same as a Morris Major.