Hope the image isn't too large... Look at the contents of the course and then the price. This is about 1940 and after 1940 there was a rapid drop in inflation, and thus slow price rises, so the course between then and say 1946, could easily have been about £350 in today's money.
We're being robbed today.
(https://i.etsystatic.com/10465392/r/il/ab60bd/1730758755/il_570xN.1730758755_6pcq.jpg)